Question

If f(x) = 2x2 + 5x - 8 and f(x) = -10,

which of the following could be a
value for x?
-2

Answer 1

x = -2 or x = -1/2

Explanation:

We can just set up an equation where the quadratic is equal to -10, and then solve the equation:

`2x^2+5x-8=-10\\2x^2+5x+2=0\\\\`

Now, factor:

`(2x+1)(x+2) = 0\\x=-2 \text{ or } x=-1/2`