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Mathematics 7 Online
OpenStudy (anonymous):

25x^2-121

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

OpenStudy (cggurumanjunath):

25x^2-121=(5x)^2-(11)^2

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