Question

Exercițiul 20 va rog, punctul b​

Answer 1

b)(x^2+3)(x^2-9)-x^2(x+1)^2+2x(x-2)^2=

x^4-9x^2+3x^2-27-(x×(x+1)^2+2x×(x^2-4x+4)=

x^4-9x^2+3x^2-27-(x^2+x)^2+2x^3-8x^2+8x=x^4-9x^2+3x^2-27-(x^4+2x^3-x^2)+2x^3-8x^2+8x=x^4-9x^2+3x^3-27-x^4-2x^3-x^2+2x^3-8x^2+8x=

-15x^2-27+8x=

-15x^2+8x-27