New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    If x 2  = 4x - 4, then find the value of [x

    3  + (x 4 /8) ][3 - x 3 ].
    A -48 Correct Answer Incorrect Answer
    B -40 Correct Answer Incorrect Answer
    C -30 Correct Answer Incorrect Answer
    D -50 Correct Answer Incorrect Answer

    Solution

    x 2  = 4x - 4
    Or, x 2  - 4x + 4 = 0
    Or, (x - 2)  2  = 0
    Or, 'x' = 2
    Required value = [2 3  + (2 4 /8)] X [3 - 2 3 ]
    = [8 + (16/8)] X [3 - 8] = (8 + 2) X (- 5)
    = 10 X (- 5) = - 50

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