Y=-x^2+8x-7 помогите срочно​

Question

Y=-x^2+8x-7 помогите срочно​

Answer 1

y=-x^2+8x-7

-х^2+8х+7=0/×(-1)

х^2-8х+7=0

D=64-4×7×1=64-28=36.

x1=8+6/2=14/2=7

x2=8-6/2=2/2=1.

Ответ:х1=7;х2=1