Question

Срочно нужно решить!

Answer 1

$\displaystyle (3x+x^2)^2-x^2(x-5)(x+5)+2x(8-3x^2)=\\9x^2+6x^3+x^4-x^2(x^2-25)+16x-6x^3=9x^2+6x^3+x^4-x^4+25x^2+16x-6x^3=34x^2+16x$