Find the range for the following functions.

  1. f(x) = x + 1 where x >= 0
  2. f(x) = x2 + 3 where x <= 0
  3. f(x) = 2/x where x >= 1


Domain – The set of inputs for a function
Range – The corresponding set of output numbers for a given domain.


  1. f(x) >= 1
  2. f(x) >= -5
  3. 0 < f(x) <= 2

About the Math Tutor – Dr Loo

I am a PhD holder with 8 years of teaching experience at secondary school and university. My expertizes are mathematics, statistics, econometrics, finance and machine learning.

Currently I do provide consultation and private tuition in Singapore. For those who are looking for math tutor in Singapore or statistics tutor in Singapore, please feel free to contact me at +65-85483705 (SMS/Whatsapp/Telegram).

Some of the math tuition in Singapore I provide includes O-level math tuition and also JC Math Tuition (H1 Math Tuition & H2 Math Tuition). On the other hand, my statistics tuition in Singapore mostly focus on pre-university level until postgraduate level.

Mathematics & Statistics Tutor in Singapore
Contact Dr Loo