Posted on

## Algebra II with Trig Ch1.3 #73

How do we work Algebra II with Trig Chapter 1.3 #73? Solution

a) Area after purple section cut out

A = (20 times 20) – 4(x^2) = -4x^2 + 400 = -4(x^2 – 100)  = -4(x + 10)(x – 10)

b) V = Area of bottom times height = (20-2x)(20-2x) x = (400-80x+4x^2)x = 4x^3 – 80x^2 + 400x = 4x(x^2 – 20x + 100)

Posted on

## Geometry Ch1.3 #23

Question from Stacy:

Chapter 1, Lesson 3, pg. 23, Set III, How to get an equilateral triangle by rearranging the polygons you cut out from the figure. (Number 5 in this set).

Shown on the left is the original shape as shown in the book,

but the four polygons are labeled 1, 2, 3, and 4.

Then on the right is shown the equilateral triangle you can make with those same polygons

## Course Resources

Algebra

Geometry

Algebra 2 with Trig

Calculus

General Questions

## Can’t Find What You Need?

• how to work a problem,
• a possible error in the textbook or teacher’s guides
• how to implement the math in your situation (questions moms ask!)

### First, try searching

Many questions have already been answered. To find a solution, just search the SEARCH bar to the right by typing the course name and the chapter.

For instance, to find and help with geometry chapter 1.3 you might search any of the following: