(a + b) (2a – 3b ) – a (a – 4b) simplify value of a, b, c
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(a + b) (2a – 3b ) – a (a – 4b)
(2a^2-3ab+2ab-3b^2) - a^2+4ab
a^2+3ab-3b^2 = 0
a^2+3b(a-b) = 0
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