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

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
Respond to this Question
Similar Questions

math
graph each of the following equations below using their intercepts? 
math
graph each of the foloowing equations below using their intercepts? 
math
Graph each of the following equations below using their intercepts? 
math
Graph each of the following equations below using their intercepts? 
math
Graph each of the following equations below using their intercepts? 
algebra
Graph each of the following equations below using their intercepts? 
algebra
Graph each of the following equations below using their intercepts? 
algebra
graph each of the following equations below using their intercepts? 
algebra
graph each of the following equations below using their intercepts? 
Math
If a graph of a quadratic function can have 0, 1 or 2 xintercepts. How can you predict the number of xintercepts without drawing the graph or (completely) solving the related equation?