Question

Решите уравнение
5(2+х)^3-5х^3=28х+30х^3

Answer 1

$5(2+x)^3-5x^3-28x-30x^3=0$
$30x^2+40+32x-30x^2=0$
$2(15x^2+20+16x-15x^3)=0$
$(15x^2+20+16x-15x^3)=0$
$15x^2+20+16x-15x^3=0$
$x=1.918347$