If a = 7 - under root 5 find ( a-1 by a) – InterviewSolution

1.

If a = 7 - under root 5 find ( a-1 by a)

Answer»

a=7-√5

finding

$\frac{a - 1}{a}$

$\frac{7 - \sqrt{5 } - 1}{7 - \sqrt{5} }$

$\frac{6 - \sqrt{5} }{7 - \sqrt{5} }$

you can RATIONALIZE the DENOMINATOR or LEAVE it

$\frac{(6 - \sqrt{5})(7 + \sqrt{5)} }{(7 - \sqrt{5)(7 + \sqrt{5)} } }$

in denominator ,you get

49-5

44

solve the NUMERATOR

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