Question

One of the solutions to x2 − 2x − 15 = 0 is x = −3. What is the other solution?

20 points if you can answer in under 30 minuets

Answer 1

x^2 - 2x - 15 = 0

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

x - 5 = 0

x = 5

x + 3 = 0

x = -3

Answer 2

x=5 x=-3

Explanation:

x^2 − 2x − 15 =0

Factor

What two numbers multiply to -15 and add to -2

-5*3 = -15

-5+3 =-2

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

Using the zero product property

x-5 =0 x+3 =0

x=5 x=-3