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Question

The greatest value assumed by the function f(x) = 5 - |x3| is

A
3
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B
8
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C
6
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D
5
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Solution

The correct option is D 5
f(x) = 5|x3|
When, x3
f(x) = 5x+3=8x
Thus, maximum value will be when x is least. x=3
Hence, f(x) = 5
When, x<3
f(x) = 5+x3 = 2+x
Thus, f(x) is maximum when x is maximum, or x=3
Hence, f(x) = 5
Thus, maximum value of the function is 5

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