Calculati (calcul algebric) :
a. (2x+1) * (2x-1) - (2x+1) * (2x+1) = ?
b. (x-2) * (x-3) - (x-1) * (x-5) = ?
c. (x-1) * (x-3) - (x-2) la puterea a -doua = ?
d. (x+2) *  x^{2} -x+3) - (x+1) * (  x^{2} +2x-5) = ?

p.s: vreau rezolvari cat mai detaliate, va rog!

1

Răspunsuri

  • Utilizator Brainly
2014-02-16T21:49:17+02:00
A. (2x+1)(2x-1-2x-1)=(2x+1)(-2)=-4x-2
b. (x-2)(x-3)-(x-1)(x-5)=x^2-5x+6-x^2+6x-5=x+1
c. (x-2)^2-1-(x-2)^2=-1
d. (x+1)(x^2-x+3)+x^2-x+3-(x+1)(x^2+2x-5)=
=(x+1)(-3x+8)+x^2-x+3=
=-3x^2-3x+8x+8+x^2-x+3=-2x^2+4x+11