Question

Упростите выражение:
(3x+x^2)^2-x^2(x-5)(x+5)+2x(8-3x^2)

Answer 1

9х^2+6x^3+x^4-(x^4-25x^2)+16x-6x^3=9x^2+25x^2+16x=34x^2+16x