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OpenStudy (anonymous):
25x^2-121
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OpenStudy (anonymous):
Factor it?
OpenStudy (anonymous):
\[ 25 x^2-121=(5 x-11) (5 x+11) \]
OpenStudy (cggurumanjunath):
a^2-b^2=(a+b)(a-b)
OpenStudy (anonymous):
Use the fact that \[ a^2 - b^2=(a-b)(a+b) \]
OpenStudy (cggurumanjunath):
a=5x;b=11
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OpenStudy (cggurumanjunath):
25x^2-121=(5x)^2-(11)^2
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