Answer :

Given, 5–4√3


Need to find the rationalizing factor


We know that if the product of two surds is rational then each is called a rationalizing factor of each other


(5–4√3)(5+4√3)


25+20√3–20√3–(16)(3)


= –23 is rational number


Rationalizing factor of (5–4√3) is (5 + 4√3)


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