Identify it! #2

Algebra Level 2

Which one of the following is not a complex number?

i 2 i\sqrt{2} 2 + 5 i 2 + 5i − 3 -3 They are all complex numbers

Munem Shahriar by Munem Shahriar , 18, Bangladesh

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1 solution

Munem Shahriar
Sep 12, 2017

Relevant wiki: Complex Numbers Arithmetic - Basic

Note that a complex number has a real part and an imaginary part, but either one could be zero.

  • − 3 = − 3 + 0 i -3 = -3 + 0i is complex

  • 2 + 5 i 2 + 5i is complex

  • i 2 = 0 + i 2 i\sqrt{2} = 0 + i\sqrt{2} is complex

Therefore they are all complex numbers. \color{#20A900} \boxed{\text{they are all complex numbers.}}

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