If $x=6+2\sqrt{6}$ ,then what is the value of $ \sqrt{x-1}+\dfrac{1}{\sqrt{x-1}}$ ?
$2\sqrt{3}$
$3\sqrt{2}$
$2\sqrt{2}$
$3\sqrt{3}$
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If a + b + c = 27, then what is the value of (a – 7)3 + (b – 9)3 + (c – 11)3 – 3(a – 7)(b – 9)(c – 11)?