## Week 6 in Precalculus 11

Tell:

One thing I have learned this week is how to solve an equation using the quadratic formula.

Show:

Explain:

In this equation you need to start with the quadratic formula. Then figure out what A =, B = and what C = . Once you have those numbers, fill them into the formula. Using BEDMAS and going step by step solve for X.

## Week 5 in Precalculus 11

Tell:

This week we started our new unit which is, “Factoring polynomial expressions”. It is a review from last year but a good refresher on how to do it.

Show:

Here is one equation I had troubles with.

Explain:

First step find two numbers that = 1 and multiply to 12. Step two place those two numbers in the middle where the x is. Step three simplify the numbers in the brackets by pulling out the common #. For the second bracket when you pull out the -1 make sure you change the signs inside (the part I didn’t do).  Both brackets should have the same binomial. Make the first brackets the binomial that are inside the two and the second bracket the numbers that you factored out.

## Week 4 in Precalc 11

Tell:

This week I learned how to divide radical expressions.

Show:

Explain:

In this question multiply the equation by the denominator. Square root the 25 to get 5, as well as the denominator. Multiply the the square rooted 25 by 2, to get 10. Nothing can be simplified any further. I was stuck on this question because I forgot to square root the 25.

## Week 3 in Precalc 11

Tell:

This week we just started to learn “Absolute Value and Radicals”. One thing that I have learned so far is how to solve an equation that is given with negative numbers and the sum will be positive, when place inside |  |  Absolute value braces / symbols.

Show:

here is one equation that I was stuck on because I didn’t place the right signs besides the numbers, which was giving me the wrong answer.

Explain:

In this equation you plug in -3 where there is an x. The equation becoming $-3^3$ and -5(-3), getting results from those then solve the final equation. Equation will become a positive due to being inside the Absolute value braces.

## Week 2 in Precalc 11

Tell:

This week I have learned how to determine a certain value for different geometric sequences, by using specific formulas created to find those results.

Show:

Explain:

In solving this problem you first need to find “R” by using the formula $\frac{t_2}{t_1}$. Once you have found “R”, you can determine $t_1$ by looking at the terms left to right. With all the information you have found now you can plug it all into the formula $t_n = t_1 * R ^(n-1)$. Using BEDMAS go step by step to find your answer.

## My Arithmetic Sequence

$3,6,9,12,15$

$t{n}=t{1}+(n-1)(d)$

$t_{50}=3+(50-1)(3)$

$t_{50}=3+147$

$t_{50}=150$

$t_{n}=3+(n-1)(3)$

$t_{n}=3+3n-3$

$t_{n}=3n$

$S_{n}=\frac{n}{2}(2(t_{1})+(n-1)(d))$

$S_{50}=\frac{50}{2}(2(3)+(50-1)(3))$

$S_{50}=25(6+147)$

$S_{50}=25(153)$

$S_{50}=3825$