Question

(c) 3(n-5)=-21
Solve the following equations:
(a) 2(x + 4) = 12 (b) 3(n-5) = 21
(d) -4(2 + x) = 8 (e) 4(2-x) = 8
with full process​

Answer 1

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Answer 1.

2(x + 4) = 12

2x + 8 = 12

2x = 12 - 8

2x = 4

x = 4/2

x = 2

Answer 2.

3(n-5) = 21

3n - 15 = 21

3n = 21 + 15

3n = 36

n = 36/3

n = 12

Answer 3.

-4(2 + x) = 8

-8 -4x = 8

-4x = 8 + 8

-4x = 16

x = 16/-4

x = -4

Answer 4.

4(2-x) = 8

8 - 4x = 8

-4x = 8 - 8

-4x = 0

x = 0 + 4

x = 4

Some other knowledge

Simple linear equation

The definition of a linear equation is an algebraic equation in which each term has an exponent of one and the graphing of the equation results in a straight line. An example of linear equation is y=mx + b.

Some formulas to remember

✏ + + = +

✏ - - = +

✏ - + = -

✏ + - = -

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