Solve 2x + 4 = −4

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

2x + 4 = -4\ \Rightarrow\ x = -4

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The lines y = 2x + 4 and y = -4 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 addition, then the multiplication.
$2x + 4 = -4$
2
Subtract 4 from both sides:
$2x + 4 - 4 = -4 - 4 \ \Rightarrow\ 2x = -8$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{-8}{2} \ \Rightarrow\ x = -4$
4
Check: put x = -4 back into the equation.
$2\cdot(-4) + 4 = -8 + 4 = -4 \checkmark$

LaTeX source of the formulas on this page

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

Trying values of x in 2x + 4 = −4

x	2x + 4	Equals -4?
-6	-8	no
-5	-6	no
-4	-4	yes
-3	-2	no
-2	0	no

Questions

What is x in 2x + 4 = −4?

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

How do you solve 2x + 4 = −4?

Subtract 4 from 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 = -4, which is -4.

Solve 2x + 4 = −4

How to work it out

Trying values of x in 2x + 4 = −4

Questions

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