Question

(x + 4)(x - 4) - (x + 12) ^ 2 найдите значение upu x = - 2.5

Answer 1

$(x + 4)(x - 4) - (x + 12) {}^{2} = {x}^{2} - 16 - ( {x}^{2} + 24x + 144) = {x}^{2} - 16 - x {}^{2} - 24x - 144 = - 24x - 160 = - 24 \times ( - 2.5) - 160 = 60 - 160 = - 100$