What does 2i mean in math terms

My answer is 2i-2 and I dont know what 2i is supposed to mean? Please help..

The term "i" represents the square route of -1 since there cannot be a square route of a negative number. This is where imaginary numbers come in and "i" is used to represent every imaginary number. This means that 2i would be 2sqr-1.

Al good answers

the answer should be written in the form -2 + 2i

the correct form for a complex number is a + bi

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It's an imaginary number - the square root of negative 4.

Well I is the square root of minus 1, which is an imaginary number, so 2i is simply 2 times this.

it's the imaginary part of your solution, while -2 is the real part.

2 i

is

2 Sqrt[-1]