# Past Papers’ Solutions | Edexcel | AS & A level | Mathematics | Core Mathematics 1 (C1-6663/01) | Year 2012 | June | Q#3

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**Question**

Show that can be written in the form , where a and b are integers.

**Solution**

We are given;

If we need a rational number in the denominator of a fraction, we need to follow procedure of “denominator rationalization” as given below.

ü If the denominator is of the form then multiply both numerator and denominator by

ü If the denominator is of the form

ü If the denominator is of the form

We can expand and simplify the denominator as follows.

We have algebraic formula;

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