Solve the following equation:
(x−2)21+x−21=1
To solve the equation (x−2)21+x−21=1, follow these steps:
- Step 1: Identify the expressions (x−2)21 and x−21.
- 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 (x−2)2. Rewrite the equation as:
(x−2)21+(x−2)2x−2=1.
Step 3: Combine the fractions:
(x−2)21+(x−2)=1.
Step 3: Simplifying gives:
(x−2)2x−1=1.
Step 3: Cross-multiply to eliminate the fraction:
x−1=(x−2)2.
Step 4: Expand the right-hand side:
x−1=x2−4x+4.
Step 4: Rearrange to form a quadratic equation:
x2−5x+5=0.
Step 5: Use the quadratic formula x=2a−b±b2−4ac. Here, a=1, b=−5, c=5:
x=25±25−20.
Step 5: Simplify:
x=25±5.
This results in two potential solutions for x:
x=21[5+5] and x=21[5−5].
Therefore, the solution to the problem is x=21[5±5], which matches the correct answer choice.
21[5±5]