Question

ajutor!!!
5·(x+1)-5=?
2x·(a+b)-x·(a-b)=?
(x+2)·(x-1)-x²=?
(-x)²-2x(x-1)=?
(4x²+3x)÷x-2x=?
(21x³-7x²)÷(-7x)=?
(a³)²-(a²)³=?
(x³)²÷x⁴-x(x-3-1)=?
(-3x)²-2x(3x-1)=?
Multumesc!

Answer 1

5*(x+1)-5=5(x+1-1)=5x
2x(a+b)-x(a-b)=x(2a+2b-a+b)=x(a+3b)=xa+x3b
(x+2)(x-1)-x²=x²-x+2x-2-x²=x-2
(-x)²-2x(x-1)=x²-2x²+2x=2x-x²
(4x²+3x)÷x-2x=x(4x+3)÷x-2x=4x+3-2x=2x+3
(21x³-7x²)÷(-7x)=(-7x)(x-3x²)÷(-7x)=x-3x²
(a³)²-(a²)³=a^6-a^6=0
(x³)²÷x^4-x(x-3-1)=x^6÷x^4-x(x-4)=x²-x²+4x=4x
(-3x)²-2x(3x-1)=9x²-6x²+2x=3x²+2x