Question

Which statement about 'square root X - 5 minus square root X = 5'' is true?

Answer 1

Answer: x=9 is an extraneous solution

Step-by-step explanation:

Given

Function is $f(x)=\sqrt{x-5}$

for function to exist

$\Rightarrow x-5\geq 0\\\Rightarrow x\geq 5$

Therefore, 9 satisfies the  above equation. It is it's extraneous solution.