2、 First simplify and then evaluate (a + b) * (a-b) - (a-2b) * (a-b), where a = 2, | Math enthusiast | Mathematical art

2、 First simplify and then evaluate (a + b) * (a-b) - (a-2b) * (a-b), where a = 2,

Solution = a * a-Ab + ab-b * B-A * a + AB + 2ab-2 * b * b = (the square of a - the square of a) + (- AB + AB + 2Ab + AB) + (- the square of B) - the square of 2 (b) = the square of 3ab-3 (B) = the square of 3 * 2 * (- 1) - 3 * (- 1) = 6 * (- 1) - 3 = - 6-3 = - 9

2、 First simplify and then evaluate (a + b) * (a-b) - (a-2b) * (a-b), where a = 2,

2、 First simplify and then evaluate (a + b) * (a-b) - (a-2b) * (a-b), where a = 2,

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