Solve the Equation: 1/(x-2)² + 1/(x-2) = 1 Step-by-Step

Question

Solve the following equation:

1(x2)2+1x2=1 \frac{1}{(x-2)^2}+\frac{1}{x-2}=1

Video Solution

Solution Steps

00:00 Solve the equation
00:03 Multiply to eliminate fractions
00:10 Since the unknown is in the denominator, find the domain
00:13 The denominator must be different from 0
00:16 This is the domain, let's continue solving
00:32 A number divided by itself is always equal to 1, let's reduce what we can
00:45 Use the distributive property to expand the parentheses
01:01 Collect like terms and solve the multiplication
01:10 Arrange the equation so one side equals 0
01:34 Find the possible solutions using the quadratic formula
01:57 Substitute the possible solutions
02:01 And this is the solution to the problem

Step-by-Step Solution

To solve the equation 1(x2)2+1x2=1\frac{1}{(x-2)^2} + \frac{1}{x-2} = 1, follow these steps:

  • Step 1: Identify the expressions 1(x2)2\frac{1}{(x-2)^2} and 1x2\frac{1}{x-2}.
  • Step 2: Combine the fractions by using a common denominator.
  • Step 3: Multiply through by the common denominator and simplify.
  • Step 4: Rearrange the resulting equation to form a quadratic equation.
  • Step 5: Solve the quadratic equation using the quadratic formula.

Carrying out these steps:

Step 2: The common denominator is (x2)2(x-2)^2. Rewrite the equation as:
1(x2)2+x2(x2)2=1\frac{1}{(x-2)^2} + \frac{x-2}{(x-2)^2} = 1.

Step 3: Combine the fractions:
1+(x2)(x2)2=1\frac{1 + (x-2)}{(x-2)^2} = 1.

Step 3: Simplifying gives:
x1(x2)2=1\frac{x-1}{(x-2)^2} = 1.

Step 3: Cross-multiply to eliminate the fraction:
x1=(x2)2x - 1 = (x-2)^2.

Step 4: Expand the right-hand side:
x1=x24x+4x - 1 = x^2 - 4x + 4.

Step 4: Rearrange to form a quadratic equation:
x25x+5=0x^2 - 5x + 5 = 0.

Step 5: Use the quadratic formula x=b±b24ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}. Here, a=1a = 1, b=5b = -5, c=5c = 5:
x=5±25202x = \frac{5 \pm \sqrt{25 - 20}}{2}.

Step 5: Simplify:
x=5±52x = \frac{5 \pm \sqrt{5}}{2}.

This results in two potential solutions for xx:
x=12[5+5]x = \frac{1}{2}[5+\sqrt{5}] and x=12[55]x = \frac{1}{2}[5-\sqrt{5}].

Therefore, the solution to the problem is x=12[5±5] x = \frac{1}{2}[5 \pm \sqrt{5}] , which matches the correct answer choice.

Answer

12[5±5] \frac{1}{2}[5\pm\sqrt{5}]