Question

simplifique as expressão algebricas

a) 3x + (x - 2) - (6x - 9) = b) ( x - y + 4 ) - ( 2x + 6y + 10) =

c) (0 +7b) -(2a + b) -(11a - 8b)

Answer 1

3x + ( x - 2) - ( 6x - 9) =
3x + x - 2 - 6x + 9 =
3x + x - 6x - 2 + 9 =
4x - 6x + 7 =
- 2x + 7
--------------------------------------------------------------
(x - y + 4) - ( 2x + 6y + 10) =
x - y + 4 - 2x - 6y - 10 =
x - 2x - y - 6y + 4 - 10 =
-x - 7y - 6
-------------------------------------------------------
(0 + 7b) - (2a + b) - ( 11a - 8b) =
7b - 2a + b - 11a + 8b =
7b + b + 8b - 2a - 11a =
16b - 13a

Answer 2

a) 3x + (x - 2) - (6x - 9) =

3x + x - 2 - 6x + 9 

3x + x - 6x - 2 + 9

4x - 6x + 7

- 2x + 7



b) ( x - y + 4 ) - ( 2x + 6y + 10) =

x - y + 4 - 2x - 6y - 10

x - 2x - y - 6y + 4 - 10

- x - 7y - 6


c) (0 +7b) -(2a + b) -(11a - 8b) = 

0 + 7b - 2a - b - 11a + 8b

7b + 8b  - b - 2a - 11a 

15b - b - 13a

14b - 13a