Question

Решите уравнение (х-6)(х+6)-(2х-3)(х-1)=6-х во 2 степени

Answer 1

x^2 - 36 - (2x^2 - 5x + 3) = 6 - x^2
x^2 - 36 - 2x^2 + 5x - 3 - 6  + x^2 = 0 
5x - 45 = 0 
5x = 45
x = 9