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Real Part
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-i\times 4-i^{2}
Multiply -i times 4+i.
-i\times 4-\left(-1\right)
By definition, i^{2} is -1.
1-4i
Do the multiplications. Reorder the terms.
Re(-i\times 4-i^{2})
Multiply -i times 4+i.
Re(-i\times 4-\left(-1\right))
By definition, i^{2} is -1.
Re(1-4i)
Do the multiplications in -i\times 4-\left(-1\right). Reorder the terms.
1
The real part of 1-4i is 1.