Hi im new! wonder if anyone can help me with this... Express 36 / 5 - (square root)7 in the form a + b (square root)7, where a and b are integers
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Originally Posted by RubbishAtMaths Hi im new! wonder if anyone can help me with this... Express 36 / 5 - (square root)7 in the form a + b (square root)7, where a and b are integers I assume that you mean: $\displaystyle \dfrac{36}{5-\sqrt{7}} = \dfrac{36}{5-\sqrt{7}} \cdot \dfrac{5+\sqrt{7}}{5+\sqrt{7}} = \dfrac{180+36\sqrt{7}}{25-7}=10+2\sqrt{7}$
Last edited by earboth; Dec 6th 2008 at 10:31 AM.
cheers matey!
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