Answer :
Plug it in.
A being the coefficient of the first term, B the coefficient of the second, and C the coefficient of the third. . .
e.g.: 4x^2 + 7x - 8
a = 4, b = 7, c = -8
A being the coefficient of the first term, B the coefficient of the second, and C the coefficient of the third. . .
e.g.: 4x^2 + 7x - 8
a = 4, b = 7, c = -8