Question

Решите уравнение:
5(x+2)²+(2x-1)²-9(x+3)(x-3)=22

Answer 1

5(x^2 + 4x + 4) + (4x^2 - 4x + 1) - 9(x^2 - 9) = 22
5x^2 + 20x + 20 + 4x^2 - 4x + 1 - 9x^2 + 81 - 22 = 0 
9x^2 + 16x + 21 - 9x^2 + 59 = 0 
16x + 80 = 0 
16x = - 80
x = - 5