Question

Se considera expresiile : D(x)=2x+5 ; E(x)= x la puterea a 2-4x ; F(x)=3x la puterea a 2-7x la puterea a 3 . Calculați:
C ) D(x) × (E(x) + x la puterea a 2 )
D) D(x) × (F(x) + x la puterea a 3 )
E) (D(x) + x la puterea a 2 ) × E (x)

Va rog urgent puncte + coroana + vot

Answer 1

 D(x) × (E(x) + x la puterea a 2 )=
= (2x+5)(x^2-4x+x^2)=(2x+5)(2x^2 -4x)
=4x^3-8x^2+10x^2-20x=
=4x^3+2x^2-20x

D(x) × (F(x) + x la puterea a 3 )=(2x+5)(3x^2-7x^3+x^3)=
(2x+5)(3x^2 -6x^3) =6x^3+15x^2-12x^4-30x^3=
= -12x^4-24x^3+15x^2

 (D(x) + x la puterea a 2 ) × E (x)= (2x+5+x^2)(x^2-4x)=
2x^3+5x^2+x^4-8x^2-20x-4x^3=
x^4-x^3-3x^2-20x