Question

Помогите решить  x²=18-3x

Answer 1

x² + 3x - 18 = 0 

D = 9 + 4*18 = 9 + 72 = 81 = 9^2

x₁ = ( - 3 +9)/2 = 6/2 = 3 
x₂ = ( - 3 - 9)/2 = - 12/2 = - 6

Answer 2

x^2=18-3x
x^2+3x-18=0
D=9+72=81
x1=(-3+9):2=3
x2=(-3-9):2=-6
Ответ:3;-6