Question

x^2+12x-27=0,x=?

Answer 1

x ² + 12 x - 27 = 0

x ² + 12 x + 36 = 27 + 36

（x + 6）² = 63

x + 6 = ± 3√7

x = ± 3√7 - 6

x1 = 3√7 - 6

x2 = - 3√7 - 6