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OpenStudy (sarahc):
Find the product of (3x + 7y)(3x − 7y). 9x2 − 42xy + 49y2 *** I choose A is that correct? 9x2 + 42xy + 49y2 9x2 − 49y2 9x2 + 49y2
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jimthompson5910 (jim_thompson5910):
This is a difference of squares, so use the idea that (a+b)(a-b) = a^2 - b^2
OpenStudy (sarahc):
oh so it's 9x^2 - 49y^2
jimthompson5910 (jim_thompson5910):
yep
OpenStudy (sarahc):
Thank you!!
jimthompson5910 (jim_thompson5910):
np
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