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Solve 3x + 15 = 0

The solution of 3x + 15 = 0 is x = -5.

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The lines y = 3x + 15 and y = 0 meet at x = -5-10-8-6-4-2-20-15-10-55101520x = -5y = 3x + 15y = 0
The lines y = 3x + 15 and y = 0 meet at x = -5. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

  1. 1

    The goal is to get x alone. Undo the operations in the opposite order: first the addition, then the multiplication.

    3x+15=03x + 15 = 0
  2. 2

    Subtract 15 from both sides:

    3x+15āˆ’15=0āˆ’15Ā ā‡’Ā 3x=āˆ’153x + 15 - 15 = 0 - 15 \ \Rightarrow\ 3x = -15
  3. 3

    Divide both sides by 3:

    3x3=āˆ’153Ā ā‡’Ā x=āˆ’5\frac{3x}{3} = \frac{-15}{3} \ \Rightarrow\ x = -5
  4. 4

    Check: put x = -5 back into the equation.

    3ā‹…(āˆ’5)+15=āˆ’15+15=0āœ“3\cdot(-5) + 15 = -15 + 15 = 0 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 15 = 0\ \Rightarrow\ x = -5 \]
\[ 3x + 15 = 0 \]
\[ 3x + 15 - 15 = 0 - 15 \ \Rightarrow\ 3x = -15 \]
\[ \frac{3x}{3} = \frac{-15}{3} \ \Rightarrow\ x = -5 \]
\[ 3\cdot(-5) + 15 = -15 + 15 = 0 \checkmark \]

Trying values of x in 3x + 15 = 0

x3x + 15Equals 0?
-7-6no
-6-3no
-50yes
-43no
-36no

Questions

What is x in 3x + 15 = 0?

The solution of 3x + 15 = 0 is x = -5.

How do you solve 3x + 15 = 0?

Subtract 15 from both sides to get 3x = -15, then divide both sides by 3 to get x = -5.

How do I check the answer?

Replace x by -5: 3(-5) + 15 = 0, which is 0.

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    Solve 3x + 15 = 0: x = -5 (steps and check) | WordGPT