Question

упростите выражение (3х+х2)2-х2(х-5)(х+5)+2х(8-3х)

Answer 1

Х(3+2)-4х(х-5)^2+2х(8-3х)

Answer 2

$(3x+x^2)^2-x^2(x-5)(x+5)+2x(8-3x)= \\ \\ = 3 x^{2} +6 x^{3} + x^{4} - x^{4}-5 x^{3} + 5 x^{3} +25 x^{2} +16x = \\ \\ = 6 x^{3}+28 x^{2} +16x$