Maths
posted by Jay .
For what values of k does the graph of y=5x^2 + kx + 1 have:
a. One xintercept
b. two xintercepts
c. No xintercepts

Maths 
Reiny
work with the discriminant b^2  4ac
if b^2  4ac = 0 you have one xintercept
if b^2  4ac > 0 you have two xintercepts
if b^2  4ac < 0 you have no xintercepts
I will do the 2nd one, you do the other cases
for 5x^2 + kx + 1,
a = 5, b = k, c = 1
k^2  4(5)(1) > 0
k^2 > 20
k > √20 OR k < √20
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