ratinalise the following Dominator 1 by root7 -2
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1/√7+2
firstly, change the sing of the denominator , i,e √7-√2 will become √7+2 , so, multiply this term both with numerator and denominator . = 1(√7+2) / (√7+2) (√7-2). multiply the terms , and we know that (a+b) = a square - b square , use this identify for denominator . =√7-2 / [√(7) square - (2) square] solve its more , square root and square will cancel out =√7+2 / (7-4). =√7+2 / (3). thus, after rationalising we will get :- √7+2 /3
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