Question

Consider the graph of the quadratic function y = x2 – 3x – 40.


What are the roots of the function?

–8 and 20
–40 and –8
–8 and 8
–40 and 20

Answer 1

Solve x^2 − 3x − 40 = 0 by factoring: x^2 − 3x − 40 = (x − 8)(x + 5).
So the roots are x = 8 and x = −5.

None of the given answer choices match.