find the value of a and b,

$\displaystyle \frac{4}{5 +\sqrt{2}} = a +b\sqrt{2} $

I dont know how to do this, any help appreciated.

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- Sep 29th 2012, 04:18 AMTweetysolve equation for two un-knows
find the value of a and b,

$\displaystyle \frac{4}{5 +\sqrt{2}} = a +b\sqrt{2} $

I dont know how to do this, any help appreciated. - Sep 29th 2012, 04:34 AMioneRe: solve equation for two un-knows
Since the fraction has a radical in the denominator, you want to simplify by multiplying both the numerator and the denominator by $\displaystyle 5-\sqrt{2}$