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4. Which of the following i a positive 1stinal nanherd. |
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Answer» ONG>ANSWER: This QUESTION is dealing with RATIONALISATION of a fraction. Rationalisation is performed to eliminate irrational expression in the denominator. For this particular case we can do this by applying the following rule: (a−b)(a+b)=a2−b2.
Multiple both numerator and denominator by √ n+1 + √ n : √ n+1 + √ n ( √ n+1 − √ n )( √ n+1 + √ n )
= √ n+1 + √ n ( √ n+1 )2−( √ n )2)
= √ n+1 + √ n n+1−n
= √ n+1 + √ n . Step-by-step EXPLANATION: |
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