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OpenStudy (anonymous):
factorise 25m^2-1
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OpenStudy (anonymous):
\[=(5m^2-1)(5m^2+1)\]
OpenStudy (anonymous):
sorry its \[=(5m-1)(5m+1)\]
OpenStudy (anonymous):
\[=(5m)^2-1\] apply \[a^2-b^2=(a-b)(a+b)\] \[=(5m-1)(5m+1)\]
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