Question

What are the solutions for x when y is equal to 0 in the quadratic function
y = x2 +9x?

Answer 1

See picture for math work and answer.

Answer 2

C) x = 0 or x = - 9

Explanation:

`y = {x}^(2) + 9x \\ \\ plug \: y = 0 \\ 0 = {x}^(2) + 9x \\ \\ x(x + 9) = 0 \\ \\ x = 0 \: \: or \: \: x + 9 = 0 \\ \\ x = 0 \: \: or \: \: x = - 9`