Question

х² +9х-10=0f[х]=х²+2х+1

Answer 1

Х² +9х-10=0
<u />D=9^2-4*1*(-10)=81+40=121
x1=(-9+11)/2=1
x2=(-9-11)/2=-10

f[<u />х]=х²+2х+1
f[<u />1]=1²+2*1+1=1+2+1=4
f[<u />-10]=(-10)²+2*(-10)+1=100-20+1=81