Question

(a-b)^2 + (a+b).(a-b)-(a+b)^2

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Answer 1

${(a - b)}^{2} + (a + b)(a - b) - {(a + b)}^{2} = \\ = {a}^{2} - 2ab + {b}^{2} + {a}^{2} - {b}^{2} - {a}^{2} - 2ab - {b}^{2} = \\ = {a}^{2} - 4ab - {b}^{2}$