Question

5. Rationalise the denominators of the following 1/3+root 2
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Answer 1

Numerator is 1.

But the denominator is 3+√2 which is an irrational number.

So we have to rationalise the denominator.

The rationalising factor or conjugate surd of 3+√2 is 3-√2.

=>Which means we have to multiply the numerator and denominator by 3-√2 to rationalise the denominator of this number.

1/3+√2×3-√2/3-√2

we will use a²- b²=(a+b)(a-b)

3-√2/9-2

3-√2/7