144 m^2 -81 Factorise plz..
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do a^2-b^2=(a+b)×(a-b)
=(144^2)-(81)
=(12m)^2-(9)^2
=(12m+9)(12m-9). over
=(144^2)-(81)
=(12m)^2-(9)^2
=(12m+9)(12m-9). over
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