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Question

Express the given fraction in terms of x, (a + b)22ab if x= ab


A

(x2 + 1)2x + 1

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B

(x2 + 1)3x + 1

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C

x2 + 1

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D

x22 + 1

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Solution

The correct option is A

(x2 + 1)2x + 1


Give algebraic fraction is: (a + b)22ab

(a + b)2 = a2 +2ab +b2

Now, (a + b)22ab a22ab + b22ab + 1

a2b + b2a + 1

Taking, 12 common

12[ab + ba] + 1

As x = ab, the expression turns to 12[x + 1x] + 1

(x2 + 1)2x + 1


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