Question

Use the Perfect Square Trinomial and provide the first step to calculating 42^2 without a calculator.

(46 − 4)2

(46 + 4)2

(40 − 2)2

(40 + 2)2

Answer 1

Answer: D) (40+2)2

I got it right on my test

Answer 2

1764

Explanation:

(40 + 2)²

40² + 2(40)(2) + 2²

1600 + 160 + 4

1764

(46 - 4)²

46² - 2(46)(4) + 4²

2116 - 368 + 16

1764