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

Question

Mathematics

Nicholas Stanton

4 February, 18:14

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

+4

Answers (1)

Know the Answer?

Abbigail · Answer 1

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

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

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