Упростите выражение (3х+х^2)-х^2(х-5)(х+5)+2х(8-3х^2)
3x+x²-x^4+25x²+16x-6x^3=-x^4-6x^3+26x²+19x
3x + x^2 - x^2 (x^2 - 25) + 16x - 6x^3 = = 3x + x^2 - x^4 + 25x^2 + 16x - 6x^3 = = - x^4 - 6x^3 + 26x^2 + 19x