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Express 4+-4as a complex number ( term of i) 4+-4

Express 4+-4as a complex number ( term of i) 4+-4-example-1

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Complex numbers are numbers in the form


z=a+bi

where i represents the imaginary number defined as the square root of minus one.


i=√(-1)

We call a as the real part of the complex number and b the imaginary part.

We want to rewrite the number


√(4)+√(-4)

in terms of the imaginary constant.

Using the following property


√(a\cdot b)=√(a)\cdot√(b)

We can rewrite the second term of our sum as


√(-4)=√((-1)(4))=√(-1)√(4)

Then, our number can be rewritten as


√(4)+√(-4)=√(4)+√(-1)√(4)

Using the definition of the imaginary unit we can rewrite our number as


√(4)+√(-1)√(4)=√(4)+√(4)i

Then, we can rewrite the square roots as


√(4)=2

The simplified version of our number is


√(4)+√(-4)=2+2i

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