Simplify :(2
a-5b) (2a-5b)
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(2a-5b)(2a-5b)
= (2a-5b)^2
= (2a)^2 + (5b)^2 - 2*2a*5b [using theorem (a-b)^2 = a^2 + b^2 - 2ab]
= 4a^2 + 25b^2 - 20ab
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