Question

(2.5l– 0.5m) and (2.5l+0.5m)

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Answer 1

$(2.5 l - 0.5 m ) (2.5 l + 0.5 m )\\\\(a+b)(a-b) = a^2 - b ^2\\\\here , \ a = 2.5 l \ b = 0.5 m \\\\(2.5 l - 0.5 m ) (2.5 l + 0.5 m ) = (2.5l)^2 -(0.5m)^2\\\\(2.5 l - 0.5 m ) (2.5 l + 0.5 m ) = 6.25 l^2 - 0.25m^2$

$hope \ it \ helps \ !!$