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Here's the question you clicked on:
Arhin
simplify 9a^2 - 4(a-b)^2
it looks like a difference of squares x^2 - y^2 where x = 3a y = 2(a-b) good luck :)
(a+b)(a-b) = a^2 - b^2
9a^2 - 4(a-b)^2 9a^2 - 4(a^2+b^2-2ab) 9a^2 - 4a^2-4b^2+8ab 5a^2-4b^2+8ab
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