Question

(a-3)2- (а-2)(а+2), при а=-2.5​

Answer 1

Ответ:

$(a - 3)2 - (a - 2)(a + 2) = 2a - 6 - a {}^{2} - 4 = 2 \times - 2.5 - 6 - 2.5 {}^{2} - 4 = - 5 - 6 - 6.25 - 4 = - 21.25$