Question

using the given quadratic function f(x)=x^2+2x-15, find the following information"Coordinates of x- intercept(zero) as ordered pairs"

Answer 1

the given expression is

f(x) = x^2 + 2x - 15

we will find x intercept by putting f(x) = 0

x^2 + 2x - 15 = 0

x^2 + 5x - 3x - 15 = 0

x(x +5) -3(x + 5) = 0

(x +5) (x -3) = 0

x = -5 & x = 3

so the ordered pairs are

(-5, 0) and (3, 0)