Question

What is the possible discriminant of the graph?

A. -13
B. zero
C. 15
D. 16

Answer 1

@campbell_st

Answer 2

ok... so 2 unequal real roots

so that eliminates negatives and zero as a choice

the roots are rational... so look for the perfect square

Answer 3

so 16 would be your choice?

Answer 4

here is an example

\[x^2 + 5x - 6 = (x -1)(x + 6)\]

so the roots exist at 1, -6

now the discriminant is \[5^2 - 4 \times 1 \times (-6) = 49\]

the discriminant is a perfect square...

Answer 5

that's it

Answer 6

Sweet thank you @campbell_st