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McGraw Hill Integrated II, 2012

MH

McGraw Hill Integrated II, 2012 View details

Study Guide and Review

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Exercise 22 Page 81

Use the formula for area with l = x^2+x-7 and w = 3x.

A=3x^3 + 3x^2 - 21x

Practice makes perfect

Recall that to find the area of a rectangle, we need to multiply length times width. In this case, the length is l = x^2+x-7 and the width is w = 3x. Let's put those into our area equation and simplify.

A = l * w

l= x^2+x-7, w= 3x

A = ( x^2+x-7)( 3x)

Distribute 3x

A = 3x^3 + 3x^2 - 21x

Subchapter links

1 Adding and Subtracting Polynomials p.81

2 Multiplying a Polynomial by a Monomial p.81

3 Multiplying Polynomials p.81

4 Special Products p.82

5 Using the Distributive Property p.82

6 Solving x^2+bx+c=0 p.83

7 Solving ax^2+bx+c=0 p.83

8 Differences of Squares p.84

9 Perfect Squares p.84

10 Roots and Zeros p.85