Question
If x 2 = 4x - 4, then find the value of [x
3 + (x 4 /8) ][3 - x 3 ].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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