Simplify: frac{1}{sqrt{12-sqrt{140}}}-frac{1} | vedclass

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(A) Given expression: $\frac{1}{\sqrt{12-\sqrt{140}}}-\frac{1}{\sqrt{8-\sqrt{60}}}-\frac{2}{\sqrt{10+\sqrt{84}}}$Step $1$: Simplify the radicals insid

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(A) Given expression: $\frac{1}{\sqrt{12-\sqrt{140}}}-\frac{1}{\sqrt{8-\sqrt{60}}}-\frac{2}{\sqrt{10+\sqrt{84}}}$Step $1$: Simplify the radicals inside the square roots by expressing them in the form $a+b-2\sqrt{ab}$.$= \frac{1}{\sqrt{12-2\sqrt{35}}} - \frac{1}{\sqrt{8-2\sqrt{15}}} - \frac{2}{\sqrt{10+2\sqrt{21}}}$Step $2$: Factor the expressions inside the square roots as squares of binomials.$= \frac{1}{\sqrt{7+5-2\sqrt{7 	imes 5}}} - \frac{1}{\sqrt{5+3-2\sqrt{5 	imes 3}}} - \frac{2}{\sqrt{7+3+2\sqrt{7 	imes 3}}}$$= \frac{1}{\sqrt{(\sqrt{7}-\sqrt{5})^2}} - \frac{1}{\sqrt{(\sqrt{5}-\sqrt{3})^2}} - \frac{2}{\sqrt{(\sqrt{7}+\sqrt{3})^2}}$$= \frac{1}{\sqrt{7}-\sqrt{5}} - \frac{1}{\sqrt{5}-\sqrt{3}} - \frac{2}{\sqrt{7}+\sqrt{3}}$Step $3$: Rationalize the denominators.$= \frac{\sqrt{7}+\sqrt{5}}{7-5} - \frac{\sqrt{5}+\sqrt{3}}{5-3} - \frac{2(\sqrt{7}-\sqrt{3})}{7-3}$$= \frac{\sqrt{7}+\sqrt{5}}{2} - \frac{\sqrt{5}+\sqrt{3}}{2} - \frac{2(\sqrt{7}-\sqrt{3})}{4}$$= \frac{\sqrt{7}+\sqrt{5}}{2} - \frac{\sqrt{5}+\sqrt{3}}{2} - \frac{\sqrt{7}-\sqrt{3}}{2}$Step $4$: Combine the fractions.$= \frac{\sqrt{7}+\sqrt{5}-\sqrt{5}-\sqrt{3}-\sqrt{7}+\sqrt{3}}{2} = \frac{0}{2} = 0$

Simplify: $\frac{1}{\sqrt{12-\sqrt{140}}}-\frac{1}{\sqrt{8-\sqrt{60}}}-\frac{2}{\sqrt{10+\sqrt{84}}}$

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