# Week 18 : Top 5 things I have learned from Pre-Cals11

1/ I learned about function but it’s more deeper than the program I studied in my home country. It was like we just know the way how to solve it faster. But in Pre-Cals11 I can know a lot of diffirent way like Factoring-Complete the Square- Quadractic Formula. Or a lot of diffirent type like parabola, hyperbola, linear,…

2/ Second one, after a lot of test. I just leanred about like I should be careful when i do the test. Also sort the time suitable for myself to complete it well.

3/ Third one, I learned how to share and discusted in group about the problem Ms.Burton teach in class.

4/ Fifth, about Absolute Value, it was like the things i studied before in my country. But for a long time, so i forgot a lot but right now i am studying it again, it reminds me a lot. And also know a lot of faster way to do it

5/ Last one, Before when i was still studying in Vietnam, i hated to do about graphing or drawn something a lot. Because it’s kinda complicated but when i study about graphing here, parabola, linear, asymptotes. It really made me insteresting and changed my mind.

Especially, Pre-Calculus helps me realized a lot of thing like i should more be careful when i do test and dont rush.!

# Week 17 : Trigonometry

This week in class Pre-Calculus 11 , we learned about Since and Cosine Law and how we can apply it to find the length side and angle of a triangle.    # Week 16 : Application of Rational Equations This week we learned about application of rational equations.

The key for this part :

First : Read the problem slowly and carefully what is being asked.
Second : Introduce a variable to represent an unknown number
Third : Write an equation the questions gave then solve
And the last one : Write anser in sentence with the unit (km/h,cm..)

Note : less than, up stream (-), greater than or added, down stream (+)

Example :

Myra takes 2 hours to plant 450 flower bulbs. Francis takes 3 hours to plant 525 flower bulbs. Working together, how long should it take them to plant 1500 bulbs? # Week 15 : Adding and Subtracting Rational Expressions with Monomial Denominators  The strategies for adding and subtracting rational numbers can be used to add and subtarct rational expressions : write the expressions with common denominator.

For the example : $\frac {2x}{7}\div\frac{5}{3x}$

So the non-permissible value is x = 0

A common denominator is $21x$ $\frac {2x}{7}\div\frac{5}{3x}$

= $\frac {6x^2+35}{21x}$ # Week 12 : Solving each liner-quadratic system algebraically # Week 11 : Solving quadratic inequalities in one variable

This week we started with new chapter: Solving quadratic inequalities in one variable. I think it same with quadratic function. So we can factor to solve it. So now let’s start with example.

Example :

2x-8>0
2x>8
x>4

4 is boundary points # Week 10 : Review Unit Test

As I think, in all four chapters I have a clear grasp of the essential knowledge that only chapter 1: Arithmetic and Geometric Sequence. I need to review important knowledge to prepare for Unit Test.  # Week 9 : Equivalent forms

This week we learned about equivalent forms.

So In short this chapter.

We learned 3 form to write quadratic function :

First one : General form : $y=ax^2+bx+c$

Second one : Standard form : $y=a(x-q)^2+p$

And the last one : Factored form : $y=a(x-x1)(x-x2)$

Cause factored form is new one we just learned so i will introduce little bit about it.  