Question

Q13 rationalize the denominator.. ​

Answer 1

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Answer 2

$\frac{1}{7 - 3 \sqrt{2} }$

$\frac{1}{7 - 3 \sqrt{2} } \times \frac{7 + 3 \sqrt{2} }{7 + 3 \sqrt{2} }$

$\frac{1 \times (7 + 3 \sqrt{2)} }{(7 {)}^{2} - (3 \sqrt{2) ^{2} } }$

$\frac{7 + 3 \sqrt{2} }{49 - 18}$

$\frac{7 + 3 \sqrt{2} }{31}$

so the answer is

$\frac{7 + 3 \sqrt{2} }{31}$