Question

What is the possible discriminant of the graph?

=15
=-11
=36
=0

Answer 1

b^2 - 4ac

Answer 2

it will be equal to zero.

Answer 3

as the graph is touching x-axis once.

Answer 4

0

Answer 5

so if its not touching the x -axis it would not be zero

Answer 6

If it's not touching then the dicriminant will be less than zero.

Answer 7

oh ok thanks

Answer 8

if it doesnt touch the x axis it is a complex solution

Answer 9

and if it's touching twice. the disc will be greater than zero.

Answer 10

http://www.purplemath.com/modules/quadform3.htm

Answer 11

if it doesnt touch, it will have complex roots (disc<0)
if it has two different roots (cross/touch x axis in two places) (disc>0)
if touches one place only, then it has two equal roots (disc = 0)