Solve 2x − 4 = −12

The solution of 2x − 4 = −12 is x = -4.

2x - 4 = -12\ \Rightarrow\ x = -4

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The lines y = 2x − 4 and y = -12 meet at x = -4. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$2x - 4 = -12$
2
Add 4 to both sides:
$2x - 4 + 4 = -12 + 4 \ \Rightarrow\ 2x = -8$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{-8}{2} \ \Rightarrow\ x = -4$
4
Check: put x = -4 back into the equation.
$2\cdot(-4) - 4 = -8 - 4 = -12 \checkmark$

LaTeX source of the formulas on this page

\[ 2x - 4 = -12\ \Rightarrow\ x = -4 \]
\[ 2x - 4 = -12 \]
\[ 2x - 4 + 4 = -12 + 4 \ \Rightarrow\ 2x = -8 \]
\[ \frac{2x}{2} = \frac{-8}{2} \ \Rightarrow\ x = -4 \]
\[ 2\cdot(-4) - 4 = -8 - 4 = -12 \checkmark \]

Trying values of x in 2x − 4 = −12

x	2x − 4	Equals -12?
-6	-16	no
-5	-14	no
-4	-12	yes
-3	-10	no
-2	-8	no

Questions

What is x in 2x − 4 = −12?

The solution of 2x − 4 = −12 is x = -4.

How do you solve 2x − 4 = −12?

Add 4 to both sides to get 2x = -8, then divide both sides by 2 to get x = -4.

How do I check the answer?

Replace x by -4: 2(-4) − 4 = -12, which is -12.

Solve 2x − 4 = −12

How to work it out

Trying values of x in 2x − 4 = −12

Questions

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