–8 + 9х – х2 = 0 сколько будет?

Question

–8 + 9х – х2 = 0 сколько будет?

Answer 1

-8 + 9х – х² = 0

D = 9² - 4·(-8)·(-1) = 81 - 32 = 49 = 7²

х₁ = (-9 - 7)/-2 = -16/-2 = 8

х₂ = (-9+7)/-2 = -2/-2 = 1

Ответ: х₁=8; х₂=1