Question

What is the possible discriminant of the graph?
–11

0

25

73

Answer 1

The discriminant is that part of the quadratic that looks like b^2 - 4ac.
You know that part, right?

Answer 2

yes. i think so

Answer 3

*that part of the quadratic formula . . .

Answer 4

ok, so think about the possible solutions you could get if the discriminant were positive, negative, zero; a perfect square, not a perfect square . . .

Answer 5

im so lost

Answer 6

Hint:

If the graph has 0 x-intercepts, then the discriminant is negative

If the graph has exactly 1 x-intercept, then the discriminant is 0

If the graph has exactly 2 x-intercepts, then the discriminant is positive

Answer 7

^ that should eliminate two of the choices.

Answer 8

so 25?

Answer 9

I doubt it with those roots . . .

Answer 10

well 73 or 0 dont have any

Answer 11

It can't be 25 because the roots look irrational (ie can't be represented by fractions)

Answer 12

so 0

Answer 13

Another rule is this:


If the discriminant is a perfect square, then the roots will be rational and can be expressed as fractions


If the discriminant is not a perfect square, then the roots will be irrational and can't be expressed as fractions

Answer 14

so what's the answer