Question

An equation is shown below:3(4x + 5) = 12Which of the following correctly shows the beginning steps to solve this equation?Step 1: 12x + 15 = 12Step 2: 12x = −3Step 1: 12x + 5 = 12Step 2: 12x = 7Step 1: 7x + 5 = 12Step 2: 7x = 7Step 1: 7x + 8 = 12Step 2: 7x = 4

Answer 1

Solution

$\begin{gathered} 3(4x+5)=12 \\ 12x+15=12 \\ 12x=12-15 \\ 12x=-3 \\ Divide\text{ }through\text{ }by\text{ }12 \\ x=-\frac{3}{12} \\ \\ x=-\frac{1}{4} \end{gathered}$

Step 1 is correct

Step 2 is correct

The first option ( or first choice ) is right.