(3a-2b) ^ 2 - (3a + b) (3a-b) = (a-3b), known 9 ^ 2 = a ^ 4,4 ^ 2 + 2 ^ B, simplified evaluation There are two answers, quick Add (2a + b) at the end | Math enthusiast | Mathematical art

(3a-2b) ^ 2 - (3a + b) (3a-b) = (a-3b), known 9 ^ 2 = a ^ 4,4 ^ 2 + 2 ^ B, simplified evaluation There are two answers, quick Add (2a + b) at the end

From 9 ^ 2 = a ^ 4 to get a = 3 or a = - 3, when a = 3, from (3a-2b) ^ 2 - (3a + b) (3a-b) = (a-3b) to get 5B & # 178; - 33b-3 = 0, when a = - 3, from (3a-2b) ^ 2 - (3a + b) (3a-b) = (a-3b) to get 5B & # 178; + 39B + 3 = 0, solve two equations, and substitute them into 4 ^ 2 + 2 ^ B for evaluation. (the formula is a bit complicated, is it a problem to solve the problem)

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