Question

Junte os termos semelhantes.

a) 3x + 9 – 2x + 7 – 6x + 12 = ...............................................................
b) x2 – 4y + 2y – 3x2 + 9 – 13 = ..............................................................
c) 8x + 3x2 - 5x2 - 7x = ............................................................................
d) -3 ( x – 8 ) + 5 ( x – 3) = ....................................................................
e) 2x + 9 ) -7 ( 4x – 2 ) = ...................................................................
ME AJUDEM

Answer 1

Resposta:

1)

a)

$- 5x + 28$

b)

$2(x - y - 5)$

c)

$x - 4$

d)

$2x + 9$

e)

$- 26x + 23$

Explicação passo-a-passo:

1)

a)

$3x + 9 - 2x + 7 - 6x + 12 \\ - 5x + 9 + 7 + 12 \\ - 5x + 28$

b)

$x2 - 4y + 2y - 3 \times 2 + 9 - 13 \\ x \times 2 - 2y - 3 \times 2 + 9 - 13 \\ x \times 2 - 2y - 6 - 4 \\ x \times 2 - 2y - 10 \\ 2(x - y - 5)$

c)

$8x + 3 \times 2 - 5 \times 2 - 7x \\ 8x + 6 - 5 \times 2 - 7x \\ 8x + 6 - 10 - 7x \\ x + 6 - 10 \\ x - 4$

d)

$- 3(x - 8) + 5(x - 3) \\ - 3x + 24 + 5(x - 3) \\ - 3x + 24 + 5x - 15 \\ 2x + 24 - 15 \\ 2x + 9$

e)

$(2x + 9) - 7(4x - 2) \\ 2x + 9 - 7(4x - 2) \\ 2x + 9 - 28x + 14 \\ - 26x + 9 + 14 \\ - 26 x + 23$