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OpenStudy (anonymous):
(3x-7)(3x+7)
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OpenStudy (anonymous):
yes
OpenStudy (anonymous):
do 3x times 3x=9x^2 then 3x times -7=-21x then 7 times 3x=21x then 7 times -7=-49 the -21x and 21x cancel leaving 9x^2-49 <-answer
OpenStudy (anonymous):
9x^2+21x-21x-49 21x-21x=0 that leaves you with: 9x^2-49
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