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Sa se calculeze: a) (3+2x) (3-2x)+5x(x-4)-2x=  b) -4(x+1)+2x=  c) (2x+1)²-(2x-1)²=  d) (x+8) (x-2)+(x+2) (x-8).Rezolvari complete.



Răspuns :


a)(3+2x) (3-2x)+5x(x-4)-2x=

9-6x+6x-4[tex] x^{2} [/tex]+5[tex] x^{2} [/tex]-20x-2x=
=9-22x+[tex] x^{2} [/tex]
b)-4(x+1)+2x=
=-4x-4+2x=
=-2x-4
c)(2x+1)²-(2x-1)²=
=4[tex] x^{2} [/tex]+1-4[tex] x^{2} [/tex]-1=
=0
d)(x+8)(x-2)+(x+2)(x-8)=
=[tex] x^{2} [/tex]-2x+8x-16+[tex] x^{2} [/tex]-8x+2x-16=
=x la puterea 4 -32