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Question

f:[4,3)A,f(x)=x2+2 is a function. Then which of the following represent's set A 
  1. [2,18]
  2. [2,11)
  3. [2,18)
  4. [2,11]


Solution

The correct option is A [2,18]
f(x)=x2+2 in x[4,3)
x2+22
Now, x2+2=2 at x=0[4,3)
and f(4)=18,f(3)=11 
f(x)[2,18],  x[4,3)

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