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OpenStudy (anonymous):
find the product (5c+4)(5c-4)
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OpenStudy (anonymous):
is it 25c^2-16?
OpenStudy (anonymous):
you would have to know that \[(a+b)(a-b)=a^2-b^2\] using that, \[(5c+4)(5c-4)=(5c)^2-(4)^2\]
OpenStudy (anonymous):
oh......you already found it!
OpenStudy (luigi0210):
Good job!
OpenStudy (anonymous):
you are right.
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OpenStudy (anonymous):
Thank you. I thought my answer was wrong
OpenStudy (anonymous):
yw..(:
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