Question

Solve the following equation

a) 3 (n-5)=21
b) -4 (2+x)=8
c) 4 (2-x)=8

Answer 1

Answer:

3(n-5)=21  

3n - 15 = 21

3n = 21 + 15  

3n = 36

n = 36/3 =12

Step-by-step explanation:

-4(2+x)=8

-8 - 4x = 8

4x = -8 - 8

x = -16/4

  = -4

c.4(2−x)=8

8−4x=8

8−8=4x

0=4x

∴x=0.

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Answer 2

Step-by-step explanation:

a) 3 (n - 5) = 21

n - 5 = $\frac{21}{3}$ = 7

n = 7 + 5 = 12

b) -4 (2 + x) = 8

2 + x = $\frac{8}{-4}$  = -2

x = -2 -2 = -4

c) 4 (2 - x) = 8

2 - x = 2

-x = 2 - 2

-x = 0

x = 0