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Discussion :: Surds and Indices

  1. If 3(x - y) = 27 and 3(x + y) = 243, then x is equal to:

    2. A.

    0
    B.

    2
    C.

    4
    D.

    6

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    Answer : Option C

    Explanation :

    3x - y = 27 = 33        x - y = 3 ....(i)

    3x + y = 243 = 35        x + y = 5 ....(ii)

    On solving (i) and (ii), we get x = 4.

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