Question

Identify which equation is a quadratic equation.
A:y = 3x(x + 8) - 15
B:y = -2x - 9
C;y + x2 = (x - 5)(x + 6)
D:y - 8 = (x - 8)(x2 + 5)

Answer 1

(A) is the quadratic eq.

Answer 2

Expand all those and see whether which equation gives you max power of 2