Question

Selesaikan persamaan kuadrat:
1. x^2 + x = 72
2. x^2 + 5x = 36

Answer 1

1. x² + x = 72
x² + x - 72 = 0
(x+9) (x-8) = 0
x+9=0 ∨ x-8=0
x=-9 ∨ x=8

2. x² + x = 36
x²+x-36=0
(x+9)(x-4)=0
x+9=0 ∨ x-4=0
x=-9 ∨ x=4

Answer 2