Question

Решите уравнение (3x+1)^2-9x(x-2)=25

Answer 1

$(3x+1)^2-9x(x-2)=25 \\\\9x^2+6x+1-9x^2+18x=25\\\\9x^2+6x-9x^2+18x=25-1\\\\24x=24\ /:24\\\\x=1$