Question

What are the zeros of f(x) = x^2 + x - 20?

Answer 1

Answer:

{-5, 4}

Step-by-step explanation:

Start by factoring f(x) = x^2 + x - 20.  Since 4*5 = 20, we suspect that the factors are (x + 5) and (x - 4).

Next, set these factors equal to zero separately and solve each resulting equation for x.  We get:

{-5, 4}