Question

simplifique as expressoes
a)x.(2x-1)+x.(1-3x)
b)(a+5).(a-5)-(a+5)^2
c)y.(y+2)-2y.(3-y)
d)(2+x)^2-(x+2)~2

Answer 1

Resposta:

Explicação passo-a-passo:

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

2x² - x + x - 3x²

-x² .(-1) =

x²

b) (a+5).(a-5)-(a+5)²

a²- 5a + 5a - 25 - a² + 25 = 0

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

y² + 2y -6y + 2y²

3y²- 4y

d) (2+x)² - (x+2)²

(4 + 4x + x²) - (x² + 4x + 4)

4 + 4x + x² - x² - 4x - 4 = 0