Solving Trigonometric Equations: Algebra 2/Trig.

Howdy math friends! In this post, we are going to learn about solving trigonometric equations algebraically.  This will combine our knowledge of algebra and trigonometry into one beautiful question! For more on trigonometric functions and right triangle trigonometry check out this post here.

Solving trigonometric equations. Sound complicated? Well, you are correct, that does sound complicated. Is it complicated? Hopefully, you won’t fund it that way after you’ve seen this example. We are going to do this step by step in the following regents question:

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How do I answer this question?

The questions want us to solve for x.

Step 1: Pretend this was any other equation and you wanted to solve for x. Thinking that way, we can move radical 2 to the other side.

Solving Trigonometric Equations

Solving Trigonometric Equations

Step 3: Now we need a value for x. This is where I turn to my handy dandy reference triangle. (This is a complete reference tool that you should memorize know). For more on special triangles, check out this post here.

Solving Trigonometric Equations
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Solving Trigonometric Equations

Step 5: Notice that cosine is positive in Quadrants I and IV. That means there are two values that x can be (one in each quadrant). We already have x=45º from Quadrant I. In order to get that other value in Quadrant IV, we must subtract 360º-45º=315º giving us our other value.

Does this make sense? Great! 🙂 Is it clear as mud? I have failed. But I have not given up (and neither should you). Ask more questions, look for the spots where you got lost, do more research and never give up! 🙂

Hopefully you enjoyed my short motivational speech. For more encouraging words and math, check out MathSux on the following websites! Sign up for FREE math videos, lessons, practice questions, and more. Thanks for stopping by and happy calculating! 🙂

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PieceWise Functions NYS Regents: Algebra

Greetings math friends, students, and teachers I come in peace to review this piecewise functions NYS Regents question.  Are they pieces of functions? Yes. Are they wise?  Ah, yeah sure, why not? Let’s check out this piecewise functions NYS Regents question below and happy calculating! 🙂

piecewise function NYS regents

1 value satisfies the equation because there is only one point on the graph where f(x) and g(x) meet.

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*Note: For an in-depth review on how to graph an equation of a line step by step, check out this post here.
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Does the above madness make sense to you? Great!

Need more of an explanation? Keep going! There is a way to understand the above mess.

How do I read this?

Looking at this piece-wise function: We want to graph the function 2x+1 but only when the x-values are less than or equal to negative 1.

We also want to graph 2-x^2 but only when x is greater than the negative one.

One way to organize graphing each piece of a piecewise function is by making a chart.

  1. Lets start by making a chart for the first part of our function 2x+1:
piecewise function NYS regents
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piecewise function NYS regents
piecewise function NYS regents
piecewise function NYS regents

Is it all coming back to you now?  Need more practice on piece-wise functions?Check out this link here and happy calculating! 🙂

Also, if you’re looking to nourish your mind or you know, procrastinate a bit check out and follow MathSux on these websites!

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Top 5 Favorite Math Websites

As we all love technology (I’m assuming since it has brought you here), I figured I should share my top favorite math sites.  These are great resources for learning things you don’t understand, practicing for an upcoming test or if you’re like me, it’s great for re-learning/teaching purposes.  Yes, even I forget how to do things and these websites are a great help.  I know the anticipation is getting to you so I’ll just get to the good stuff now. Here are my top 5 favorite math websites:

  1. Khan Academy : This is a non profit over in Silicon Valley.  They have a great range of subjects (k-college level)  and explain everything via easy to follow videos.
  2. Regent’s Prep: The title is pretty self explanatory, but this helps with reviewing for the New York State Regent’s.  This site has a lot of great examples and answers.
  3.  MathSux:  So fabulous, no explanation is required. 😀
  4.  Knewton:  Pretty cool things are happening at this web address.  You can make an account, answer some questions and the questions will adjust according to your answers figuring out what you need help in.
  5. Kahoot: Fast and easy quizzes that are good for an entire classroom or for studying alone.  Either way there are lots of bright and happy colors that make you forget you’re studying anything in the first place.

So those are the goods, the contraband, the info you can’t find anywhere else (all lies).  Hope you find these websites useful. Let me know if you end up using any of them.  🙂

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Factor by Grouping: Algebra 2/Trig.

Hey math friends! In this post, we are going to go over Factor by Grouping, one of the many methods for factoring a quadratic equation.  There are so many methods to factor quadratic equations, but this is a great choice, for when a is greater than 1. Also, if you need to review different types of factoring methods, just check out this link here.  Stay curious and happy calculating! 🙂 Before we go any further, let’s just take a quick look at what a quadratic equation is: Usually, we can just find the products, the sum, re-write the equation, solve for x, and be on our merry way.  But if you notice, there is something special about the question below. The coefficient “a” is greater than 1/. This is where factor by grouping comes in handy! Now that we know why and when we need to factor by grouping lets take a look at our Example: factor by groupingFactor by Grouping Factor by Grouping

Factor By Grouping: Hard to solve? No.  Hard to remember? It can be, just remember to practice, practice practice! Also, if you are in need of a review of other methods of factoring quadratic equations, click this link here.

Want more Mathsux?  Don’t forget to check out our Youtube channel and more below! And if you have any questions, please don’t hesitate to comment. Happy Calculating! 🙂

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Equation of A Circle: Geometry

Equation of A Circle

Ahoy math friends and welcome to Math Sux! In this post, we are going to learn about the equation of a circle, mainly how to write it when given a circle on a coordinate plane. We’ll see how to find the radius and center from the graphed circle and then see how to transfer that into our equation of a circle. And we’re going to do all of this step by step with the following Regents question. Stay curious and happy calculating! 🙂

Equation of A Circle

How do I Answer this Question?

Let’s mark up this coordinate plane and take as much information away from it as possible. When looking at this coordinate plane, we can find the value of the circle’s center and the circle’s radius.

Equation of A Circle

Now that found the center and radius, we can fit each into our equation:

Center=(-3,-4)

Radius=5

The only equation that matches our center and radius, is choice (2).

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If the above answer makes sense to you, that’s great! If you need a little further explanation, keep going!

Equation of a Circle:

Equation of a Circle: Let’s take a look at our answer and break down what each part means:

Equation of A Circle

So what do you think of circles now?  Not to shabby, ehh?  🙂

Looking for more on circles?  Check out this post on how to find the Area of a Sector here!

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Solving Log Equations: Algebra 2/Trig.

Ahoy math friends! In this post, we are going to focus on solving log equations by solving this Regents questions step by step. We’ll answer this question right away! But if you need more of a review, keep reading and you will find what logarithms are, the different kinds of logarithms rules, and some simpler examples. Ready for our first example?! Check it out below:

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How do I Answer this Question?

Step 1: Let’s re-write the equation to get rid of the “log.”

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Solving Log Equations

Step 2: Solve for x in our new equation (5x-1)(1/3)=4

Solving Log Equations

If the above answer makes sense to you, great! If not, that’s ok too, keep reading for a review on solving log equations.

What are Logarithms?

Logarithms are inverses of exponential equations. Take a look below for a clearer picture.

Solving Log Equations

Basic Formula:

Logarithms can be re-written to get rid of the word “log.” This makes them easier to solve and understand.

Solving Log Equations
Solving Log Equations

Log Rules:

There are a few rules you have to memorize get used to with practice. These rules are used when solving for x in different kinds of algebraic log problems:

Solving Log Equations

Still got questions?  No problem! Check out the videos below and the post here for more on logarithms! Also don’t forget to subscribe below to get the latest FREE math videos, lessons, and practice questions from MathSux. Thanks for stopping by and happy calculating! 🙂

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