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OpenStudy (anonymous):
81x^2-72x+16 is a perfect square trinomial? True or False
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OpenStudy (anonymous):
yes it is
OpenStudy (anonymous):
yeah , here we go!
OpenStudy (anonymous):
what number squared is 81?
OpenStudy (anonymous):
81=9x9 16=4x4 right
OpenStudy (anonymous):
yes right so far
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OpenStudy (anonymous):
so your final job is to check to see what \(2\times 9\times 4\) is
OpenStudy (anonymous):
72
OpenStudy (anonymous):
then you win !
OpenStudy (anonymous):
thanks bro
OpenStudy (anonymous):
\[81x^2-72x+16=(9x-4)^2\] yw
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