Question

I dont understand this question i am confused

Answer 1

y=x²-8x+17.

Explanation:

1) no roots is if Δ=(b/2)²-ac<0 (y=ax²+bx+c);

2) according to the rule above y=x²-8x+17 is correct answer only, for 16-17<0.

P.S. for more info see the attached graph.