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Question

Rationalise the denominator of each of the following:
3-13+1

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Solution

On multiplying the numerator and denominator of the given number by 3-1, we get:
3-13+1 = 3-13+1×3-13-1 =3-1232-12= 3+1-233-1=4-232= 2(2-3)2=2-3

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