Question

simplique as expressões:

a) x.(2x+1)+x.(1-3x)

b) (a+5).(a-5)-(a+5)

c) y.(y + 2) - 2y(3-y)

d) (2+x)² - (x+2)²

Answer 1

a)2x²+x+x-3x²      

2x²-3x²+2x

-x²+2x

b)a²-5a+5a-25-a-5

a²-a-25-5

a²-a-30

c)y²+2 -6+ 2y²

y²+2y²+2-6

3y²-4

d)(4+2x+2x+x²) - (x²+2x+2x+4)

4+4x+x² -x²-2x-2x-4

x²-x² +4x-4x +4-4

0