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OpenStudy (anonymous):
81^2 - 64y^2 difference of two squares, or grouping?
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jimthompson5910 (jim_thompson5910):
assuming you mean 81x^2 - 64y^2, you use the difference of squares formula 81x^2 - 64y^2 (9x)^2-(8y)^2 (9x-8y)(9x+8y)
OpenStudy (anonymous):
ah okay ty.
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