Question

efetue as expressões a seguir:

a)3(x - 7)
b) -3(x - 7)
c)-(2x - 1)
d)-5 (3x - 4)
​

Answer 1

A) 3x+21
3x=21
X=21:3
X=7

Answer 2

Resposta:

a) 3(x- 7)

=3x - 21

b) -3(x-7)

= -3x + 21

c) -(2x -1)

= -2x + 1

d) -5(-3x - 4)

= 15x +20