Question

if a>0 then the expression ax2+bx+c is positive for all values of x provides
1)b2-4ac >0
2)b2-4ac<0
3)b2-4ac=0
4)b2-ac<0

Answer 1

Answer:

1. $b^2-4ac>0$

This is because the discriminant should be greater than 0 so that the roots are unequal and positive.

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