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OpenStudy (anonymous):
X^2-9
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OpenStudy (cggurumanjunath):
(x+3)(x-3)
OpenStudy (cggurumanjunath):
x^2-9=(x)^2-(3)^2
OpenStudy (cggurumanjunath):
a^2-b^2=(a+b)(a-b)
OpenStudy (cggurumanjunath):
a=x;b=3
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