Question

simplifique as expressões

a- 5(2a+4)
b- -8n - (n + 9) + 21
c- 3x + (x - 2)-(6x-9)
d- (x - y + 4 ) - ( 2x + 6y + 10)
e- -(-13y + 32) - (-y + 3)
f- (a + 7b) - (2a + b) - (11a - 8b)

Answer 1

.. a) 10a+20 .. b) -9n+12 .. c) -2x+7 .. d) -x-7y-6 .. e) 14y-35 .. f) -12a+14b

Answer 2

a)
=  5.(2a + 4)
= 10a + 20

b)
= - 8n - (n + 9) + 21
= - 8n - n - 9 + 21
= - 9n + 12


c)
= 3x + (x - 2) - (6x - 9)
= 3x + x - 2 - 6x + 9
= 4x - 2 - 6x + 9
= 4x - 6x - 2 + 9
= - 2x + 7

d)
= (x - y + 4 ) - ( 2x + 6y + 10) 
= x - y + 4 - 2x - 6y - 10
= x - 2x - y - 6y + 4 - 10
= - x - 7y - 6

e)
=  -(-13y + 32) - (-y + 3)
= 13y - 32 + y - 3
= 14y - 35

f)
= (a + 7b) - (2a + b) - (11a - 8b)
= a + 7b - 2a - b - 11a + 8b
= a - 2a - 11a + 7b - b + 8b
= - a - 11a + 6b + 8b
= - 12a + 14b