Question

Efectuati calculele:a)2x(x+5)+(x-1)(x+1)=
b)(x+3)²-2x(x+2)=
c)(x-2)²+x(x-2)=
d)x(x²+2x-3)-x(x²+2)=

Answer 1

a)2x(x+5)+(x-1)(x+1)=
2x²+10x+(x²-1)=
2x²+10x-1=0
b)(x+3)²-2x(x+2)=
(x²+6x+9)-2x²-4x=
x²+6x+9-2x²-4x⇒
-x²+2x+9

c)(x-2)²+x(x-2)=
x²-4x+4+x²-2x=.2x²-6x+4

d)x(x²+2x-3)-x(x²+2)=
x³+2x²-3x-x³-2x=
2x²-5x=
sucees