Question

Quadratic equations and functions.
n^2+2n-15=0

Answer 1

the answer is n=3 or n=-5

Answer 2

n = -5, 3.

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.