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McGraw Hill Integrated II, 2012

MH

McGraw Hill Integrated II, 2012 View details

Preparing for Standardized Tests

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Exercise 3 Page 88

Use the formula for the area of a square.

D

Practice makes perfect

To find the area of the square, we will use the formula for calculating the area of a square. A=s^2 We were told that the side length s is equal to x-4. To find the area of the square, we will substitute this value into the formula to calculate A.

A=s^2

s= x-4

A=( x-4)^2

ExpandNegPerfectSquare

(a-b)^2=a^2-2ab+b^2

A=x^2-2(x)(4)+4^2

Calculate power and product

A=x^2-8x+16

The area of the square is x^2-8x+16. Therefore, the correct option is D.

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Exercises p.88