Question

3(4x + 5) = 12 Which of the following correctly shows the beginning steps to solve this equation?

A: Step 1: 12x + 15 = 12 Step 2: 12x = –3
B: Step 1: 12x + 5 = 12 Step 2: 12x = 7
C: Step 1: 7x + 5 = 12 Step 2: 7x = 7
D: Step 1: 7x + 8 = 12 Step 2: 7x = 4

Answer 1

a

Explanation:

Answer 2

The correct answer is A.

Here is the completed problem:

3(4x+5)=12

Distributive property.

3(4x+5)=12

Simplify

12x+15=12

Subtract 15 from both sides.

12x+15−15=12−15

12x=−3

Divide both sides by 12.

12x/12 = −3/12

x= −1/4