Х²<span> +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]=х</span><span>²+2х+1
</span>f[<u />1]=1²+2*1+1=1+2+1=4
f[<u />-10]=(-10)²+2*(-10)+1=100-20+1=81
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