Solve the Absolute Value Equation: Balancing |x-1| and |2x+3|

Question

x1=2x+3 |x-1|=|2x+3|

Video Solution

Step-by-Step Solution

To solve the equation x1=2x+3 |x-1| = |2x+3| , follow these steps:

  • First, recall the property: for any real numbers a a and b b , a=b |a| = |b| implies a=b a = b or a=b a = -b .
  • We will consider two cases based on this property:

Case 1: Assume x1=2x+3 x-1 = 2x+3 .
Simplify the equation:
x1=2x+3 x-1 = 2x+3
Subtract x x from both sides:
1=x+3 -1 = x+3
Subtract 3 from both sides:
x=4 x = -4 .

Case 2: Assume x1=(2x+3) x-1 = -(2x+3) .
Simplify the equation:
x1=2x3 x-1 = -2x-3
Add 2x 2x to both sides:
3x1=3 3x-1 = -3
Add 1 to both sides:
3x=2 3x = -2
Divide everything by 3:
x=23 x = -\frac{2}{3} .

Therefore, the solutions to the equation x1=2x+3 |x-1| = |2x+3| are x=4 x = -4 and x=23 x = -\frac{2}{3} .

These solutions correspond to answer choice 4: x=4 x = -4 , x=23 x = -\frac{2}{3} .

Thus, x=4 x = -4 and x=23 x = -\frac{2}{3} .

Answer

x=4 x=-4 , x=23 x=-\frac{2}{3}