Question

Consider the function f(x)=x^2+2x-15.what are the x-intercepts of the function?

Answer 1

x=3 and x= -5

Explanation:

x^2+2x-15

Find the numbers that can be multiplied to equal the last term and added to equal the second term: x^2+5x-3x-15

Factor: x(x+5)-3(x+5)

Then you get: (x-3)(x+5)=0

Answer: x=3 and x=-5