-4
-3
0
6
Correct answer is D
y=x2−6x+11
y=a(x−h)2+k
a(x−h)2+k=a(x2−2hx+h2)+k
ax2−2ahx+ah2+k=x2−6x+11
Comparing, we have
a=1
2ah=6⟹2h=6;h=3
ah2+k=11⟹(1×32)+k=11
9+k=11⟹k=2
∴a+h+k=1+3+2=6
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