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OpenStudy (anonymous):
simplify the expression (n+9)(n-9)
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OpenStudy (uri):
n(n-9) +9 (n-9) n^2-9n+9n-81 n^2-81
OpenStudy (anonymous):
Try expanding the brackets
OpenStudy (uri):
-9n +9n will be cancelled.
OpenStudy (anonymous):
The arrows mean multiply.|dw:1376742782814:dw|
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