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

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0

792

1

Guest Oct 17, 2014

+23254

+5

Best Answer

Use the distributive property:

(x + 3)(2x + 7) = (x)(2x) + (x)(7) + (3)(2x) + (3)(7) = 2x² + 7x + 6x + 21 = 2x² + 13x + 21

-2x(x + 3) = (-2x)(x) + (-2x)(3) = -2x² - 6x

2x² + 13x + 21 - 2x² - 6x = 7x + 21

geno3141 Oct 17, 2014

geno3141 · Answer 1 · 2014-10-17T01:57:01

Use the distributive property:

(x + 3)(2x + 7) = (x)(2x) + (x)(7) + (3)(2x) + (3)(7) = 2x² + 7x + 6x + 21 = 2x² + 13x + 21

-2x(x + 3) = (-2x)(x) + (-2x)(3) = -2x² - 6x

2x² + 13x + 21 - 2x² - 6x = 7x + 21