# Week 18 – Top 5 things I learned in Pre Calc

5. Sine law, with the sine law, you’re either given: 2 sides and one angle, or 2 angles and a side to find either the side or the angle.

4. How to use the Quadratic Formula, you usually use this method when you can’t factor a quadratic equation, you’re guaranteed to get the roots of the equation, this is very useful, but can take up a lot of time

3. Absolute Value, an absolute value equation will have the 2 longer lines, almost acting as brackets, when it’s in absolute value, it means how far a number is away from 0, you can’t get a negative answer for absolute value.

2. Arithmetic Series and sequences, recognizing patterns is a great skill to use in your everyday life, finding the tn, for me is the hardest part.

1. Factoring, I feel like the most important skill I learned this year was to factor, because it applies to more than 1 unit, to expand a question in rational equations is the first step and foiling is used a lot within the semester.

# Week 17 – Sine Law

This week I learned how to use the Sine Law. First is you need to determine which side or angle you’re looking for, if you need to find the angle, you put the Sin on top of the fraction, if you’re looking for the side length then you put x or whatever the letter is on top of the fraction. Then you move the denominator over to multiply by the top of the fraction on the other side of the equation If you’re looking for the angle you always need to use inverse sin, if you’re looking for the angle, then you can use regular sin.

# Week 16 – Angles in Standard Position

This week I learned how to find different angles in standard position. First if they give you the point, then you have to determine the side lengths of the triangle. Then you use pythagoreas theorm to determine the hypotenuse. After that, then you use SOH CAH TOA to find the angle.

# Week 15 – Adding and Subtracting Rational Expressions

This week I learned how to add and subtract rational expressions.

First is to check the denominator, if they’re the same then you can go ahead and add or subtract straight across, if not then you will have to bring the denominator up and distribute it. After that it’s just combining like terms.

# Week 14 – Multiplying Rational Expressions

This week I learned how to multiply rational expressions. First you have to see if you can factor anything, next step is to start cancelling out common factors, once they’re cancelled out, then you can either leave it or divide if needed.

# Week 13 – Solving Absolute Value Equations

This week I learned how to solve absolute value equations. This question asked to use algebra to solve so I have to find the roots of the equation. Usually you would need to do one positive equation and one negative, but for this case the positive gave me both roots. All I had to do was move the 2 over to the other side of the equation, then factor it out. That gave me both of my roots. The negative one didn’t work for this equation as well.

# Week 10 – Solving Quadratics by Factoring

This week I went back and looked at solving quadratics. First step is to look at the “a value” if it’s just x

then it’s a lot easier to work with. Next step is to find the factors of the “c value” and so it and the “a value” can add to the “b value.” last step is to make it a zero pair by putting the opposite sign to cancel it out.

# Week 12 – Solving Systems of Equations Algebraically

This week I learned how to solve systems of equations algebraically. First step is to isolate the variable, in this case I didn’t have to isolate, next is to substitute the x and y into the other equation, and the last step is to solve.

# Week 11 – Graphing Inequalities and Systems of Equations

This week I learned how to determine weather a point is going to be a solution in a inequality.

First you have to move either x or y over, in this case the y was easier to move because it was originally negative. After you move your x or y over, then you plug in the point that you have to find out if it’s a solution or not. If you plug everything in and solve, it’ll be a solution if the inequality is true.

# Week 9 – Analyzing Standard Form

This week I learned how to use standard form, from standard form you can find the vertex, and to find the y intercept, you just plug in 0 where x is and solve for the rest of it. If you find where the parabola opens and where the vertex is, you can tell how many x intercepts there will be, in this question the parabola opens up and the vertex has both positive numbers so there were no x intercepts.