Question

х + (5х +2 ) ^2 = 25(1+х^2) погодите решить уравнение.

Answer 1

$x + (5x + 2)^2 = 25(1+x^2) \ x+25x^2+20x+4=25+25x^2 \ 21x+25x^2-25x^2=25-4 \ 21x=21 \ x=1$