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Solve 4x + 4 = 40

The solution of 4x + 4 = 40 is x = 9.

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The lines y = 4x + 4 and y = 40 meet at x = 94681012142030405060x = 9y = 4x + 4y = 40
The lines y = 4x + 4 and y = 40 meet at x = 9. 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.

    4x+4=404x + 4 = 40
  2. 2

    Subtract 4 from both sides:

    4x+4−4=40−4 ⇒ 4x=364x + 4 - 4 = 40 - 4 \ \Rightarrow\ 4x = 36
  3. 3

    Divide both sides by 4:

    4x4=364 ⇒ x=9\frac{4x}{4} = \frac{36}{4} \ \Rightarrow\ x = 9
  4. 4

    Check: put x = 9 back into the equation.

    4⋅9+4=36+4=40✓4\cdot9 + 4 = 36 + 4 = 40 \checkmark
LaTeX source of the formulas on this page
\[ 4x + 4 = 40\ \Rightarrow\ x = 9 \]
\[ 4x + 4 = 40 \]
\[ 4x + 4 - 4 = 40 - 4 \ \Rightarrow\ 4x = 36 \]
\[ \frac{4x}{4} = \frac{36}{4} \ \Rightarrow\ x = 9 \]
\[ 4\cdot9 + 4 = 36 + 4 = 40 \checkmark \]

Trying values of x in 4x + 4 = 40

x4x + 4Equals 40?
732no
836no
940yes
1044no
1148no

Questions

What is x in 4x + 4 = 40?

The solution of 4x + 4 = 40 is x = 9.

How do you solve 4x + 4 = 40?

Subtract 4 from both sides to get 4x = 36, then divide both sides by 4 to get x = 9.

How do I check the answer?

Replace x by 9: 4(9) + 4 = 40, which is 40.

Similar equations

    Solve 4x + 4 = 40: x = 9 (steps and check) | WordGPT