Solve the Absolute Value Equation: Find x in |x - 3| = 4

Question

x3=4 \left|x-3\right|=4

Video Solution

Step-by-Step Solution

To solve the equation x3=4 |x - 3| = 4 , follow these steps:

  • Step 1: Understand that x3=4 |x - 3| = 4 means x3 x - 3 can be either 4 or -4.
  • Step 2: Set up two separate equations:
    • Equation 1: x3=4 x - 3 = 4
    • Equation 2: x3=4 x - 3 = -4
  • Step 3: Solve each equation for x x .
  • Let's solve Equation 1:
    x3=4 x - 3 = 4
    Add 3 to both sides:
    x=4+3 x = 4 + 3
    x=7 x = 7

    Now, solve Equation 2:
    x3=4 x - 3 = -4
    Add 3 to both sides:
    x=4+3 x = -4 + 3
    x=1 x = -1

    Therefore, the solutions to the equation x3=4 |x - 3| = 4 are x=7 x = 7 and x=1 x = -1 .

    Checking the given choices, the correct answer is:
    x=1 x = -1 , x=7 x = 7 , which matches choice 1.

Answer

x=1 x=-1 , x=7 x=7