Question

Efectuati calculele : 
a) 2(x-1)-3(x-2)
b) 2(x+3)-(x+1)
c) 2(x+5)-(x-1)
d)x(2x-1)-2x la puterea a 2
e) x(4x-1)-4x la puterea a 2
f) 5(x-1)-10x

Answer 1

a) 2x-2-3x+6= -x+4
b)2x+ 6- x-1=x+5
c) 2x+10-x+1= x+11
d) 2x la a doua-x-2x la a doua= -x
e)4x la a doua-x- 4x la a doua= -x
f)5x-5-10x= -5x-5

Answer 2

a) 2x-2-3x+6=5x+4
b) 2x+6-x-1=x+5
c) 2x+10-x+1=x+11
d) x(2x-1)-2x la puterea a 2=2x²-x-2x=(2x²-3x)²=4x la puterea a4-6x³-6x³+9x²=4x la puterea a 4-12x³+9x
e) 4x²-x-4x=(4x²-5x)²=16x la puterea a 4-20x³-20x³+25x²=16x la puterea a 4 -40x³+25²
f) 5x-5-10x=-5x-5