- #1
undefinable
- 4
- 0
Homework Statement
Find k such that the graph of y=9x^2 + 3kx + k
A) intersects the x-axis in one point only
B) intersects the x-axis in two points
C) does not intersect the x-axis
Homework Equations
D= b^2 − 4ac
y= ax^2+bx+c
quadratic equation
The Attempt at a Solution
I got A but using the discriminent b^2-4ac= 0 meaning there is one root. but I have no idea how to get B and C. The answer is
B) k < 0 or k >4
C) 0<k<4