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Vivi19
a fost răspuns

Calculati:
a) 2x+3+5(x-1)+2
b) 2x(x+3)-5(x-4)
c) (x+4)²-(x+3)²-(x+2)²+ (x+1)²
d) (2x+1) (2x-1)

Răspuns :

NIKERMAN
a) 2x+3+5x-5+2=7x+5-5=7x
b) 2x^2+6x-5x+20=2x^2+x+20
c)x^2+8x+16-x^2-6x-9-x^2-4x-4+x^2+2x+1=4
d) 4x^2-2x+2x-1=4x^2-1

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