Question

5х(х-3)²--5(х-1)³+15(х+2)(х-2)=5

Answer 1

$5x(x-3)^2-5(x-1)^3+15(x+2)(x-2)=5$
$5x(x^2-6x+9)-5(x^3-3x^2+3x-1)+15(x^2-4)-5=0$
$5x^3-30x^2+45x-5x^3+15x^2-15x+5+15x^2-60-5=0$
$30x-60=0$     $|:30$
$x=2$
Ответ: $2$