rationalising the denominator 7/3-√2
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Rationalizing the denominator
7-3√2/7+3√2
Multiply the numerator and denominator by 7-3√2
=(7-3√2)/(7+3√2)×(7-3√2)/(7-3√2)
write the repeated multiplication in exponential form.
(7-3√2)²/49-9×2
using(a-b)²=a²-2ab+b² expand the expressions
49-42√2+18/49-18
Add the numbers.
67-42√2/49-18
=67-42√2/31
Hope it's help you.
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