Question

Упростите выражение:(6x-x^2)^2-x^2(x-1)(x+1)+6x(3x+2x^2)

Answer 1

$(6x- x^{2} )^{2}-x^{2}(x-1)(x+1)+6x(3x+2x^{2})=$
$=36x^{2}-12x^{3}+x^{4}-(x^{2}*(x^{2}-1))+18x^{2}+12x^{3}=$
$=36x^{2}+x^{2}+18x^{2}=$
$=55x^{2}$