Answer:
b
Step-by-step explanation:
x² + 3x = 180
x² + 3x - 180 = 0
Sum = 3
Product = -180
Factors = 15 , -12 {15 *(-12) = -180 & 15 + (-12) = 3 }
x² + 15x -12x - 180 = 0
x² + 15x - 12x - 12*15 = 0
x(x + 15) - 12(x + 15) = 0
(x +15)(x - 12) = 0
x + 15 = 0 ; x -12 = 0
x= -15 ; x = 12
