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Question

Which of the following functions are identical to f(x)?

f(x)={x,1x<2x2,2x<3

(1 x < 3 )


A

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B

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C

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D

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Solution

The correct option is B


We will go through the options and eliminate .

(A) [x]x

If 1 x<2,[x]x=1x=1

Wrong

(C), (D) are wrong because in the interval 1 x < 2

they are not equal to x ( f(x) is equal to x in this interval )

(B) satisfies all the condtions

[x] = 1 , if 1 x < 2

[x] = 2 , if 2 x < 3


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