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OpenStudy (anonymous):
Find the product: (9x-5y)(9x+5y)= (9x)(9x) + (9x)(5y) + (-5y)(9x) + (-5y)(5y) = 81x^2 + 45xy-45xy-25y^2= 81x^2-25y^2 Am I correct?
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OpenStudy (cwrw238):
yes - this is an example of the 'difference of 2 squares' a^2 - b^2 = (a + b)(a - b)
OpenStudy (anonymous):
ok, ty
OpenStudy (cwrw238):
yw
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