Question

Which solution to the equation StartFraction 1 Over x minus 1 EndFraction = StartFraction x minus 2 Over 2 x squared minus 2 EndFraction is extraneous?

Answer 1

Answer:

C. x = 1

Step-by-step explanation:

Which solution to the equation StartFraction 1 Over x minus 1 EndFraction = StartFraction x minus 2 Over 2 x squared minus 2 EndFraction is extraneous?

x = 1 and x = –4

neither x = 1 or x = –4

x = 1

x = –4

Answer 2

Answer:

Therefore x = 1 is an extraneous solution.

Step-by-step explanation:

The solution to the equation StartFraction 1 Over x minus 1 EndFraction = StartFraction x minus 2 Over 2 x squared minus 2 EndFraction

$\Rightarrow \frac{1}{x - 1} = \frac{x- 2}{2x^2-2} \hspace{0.3cm} \Rightarrow \hspace{0.3cm} 2x^2 - 2 = (x-1)(x-2)$

therefore $2x^2 - 2 = x^2 - 3x + 2 \hspace{0.3cm} \Rightarrow \hspace{0.3cm} x^2 + 3x - 4 = 0$

therefore $x^2 + 3x - 4 = 0 \hspace{0.3cm} \Rightarrow = \hspace{0.3cm} (x-1)(x+4) = 0$

therefore x = 1 and x = -4 but we can see that if we place x = 1 in the original solution then $\frac{1}{x-1} = \frac{1}{1-1} = \frac{1}{0}$ which is indeterminate.

Therefore x = 1 is an extraneous solution.