Question

if 1<a<2 then
$\sqrt{a - 2 \sqrt{a - 1} } - \sqrt{a + 2 \sqrt{a - 1} }$
can be:
(a)2
(b)
$- 2 \sqrt{a - 1}$
(c)0
(d)
$\sqrt{(a - 1)}$



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Answer 1

Answer:

$- 2 \sqrt{a - 1}$

hope it's helpful

Answer 2

$- 2 \sqrt{a + 1}$

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