Question

answer this question correctly asap

Answer 1

for rationalising a denominator we should multiply the number with

(1/√7 -2)= (1/√7 -2) * (√7 +2/√7 +2) , as multiplying by 1 gives the same fraction

or(1/√7 -2)=  (√7 +2/ √7²+2²) = (√7 +2/ 7+4) = (√7 +2/ 11)

so after rationalising the denominator we get (√7 +2/ 11)