Quadratic equations and functions.

n^2+2n-15=0

n = - 5, 3.

Step-by-step explanation:

n^2 + 2n - 15 = 0

Let's check if we can factor this quadratic:

We need 2 numbers whose product is - 15 and whose sum is + 2.

There are 2 such numbers and they are + 5 and - 3, so the factors are:

(n + 5) (n - 3) = 0.

n + 5 = 0 or n - 3 = 0

therefore the zeroes are - 5 and 3.

The answer is n=3 or n=-5