Question

If f(x) = 2x2 + 5x - 8 and f(x) = -10, which of the following could be a value for x? -2

Answer 1

Answer:

x = -2 or x = -1/2

Step-by-step 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:

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