Question

Найдите значение выражения

Answer 1

$(x-6) ^{2} - (x+2)(x+8) = x ^{2} - 12x + 36 - (x^{2} + 8x + 2x + 16) = x ^{2} - \\ 12x + 36 - x ^{2} - 8x - 2x - 16 = -12x - 10x + 36 - 16 = 20 - 22x = 20 \\ - 22(-0.5) = 20 + 22*0.5 = 20 + 11 = 31$

Answer 2

${(x - 6)}^{2} - (x + 2)(x + 8) = \\ = {x}^{2} - 12x + 36 - {x}^{2} - 2x - 8x - 16 = \\ = - 22x + 20 \\ \\ x = - 0.5 \\ \\ - 22 \times ( - 0.5) + 20 = 11 + 20 = 31$
Ответ: 31