Asked by jennifer
factor completely
Z^2-18Z+81-25x^2
I have tried this one several times and just can't seem to get it.
please help
Z^2-18Z+81-25x^2
I have tried this one several times and just can't seem to get it.
please help
Answers
Answered by
Reiny
this is a variation of the difference of squares
Z^2-18Z+81-25x^2
= (z-9)^2 - (5x)^2
= (z-9+5x)(z-9-5x)
Z^2-18Z+81-25x^2
= (z-9)^2 - (5x)^2
= (z-9+5x)(z-9-5x)
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