Evaluate
-60-30i
Real Part
-60
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6i\left(-5\right)+6\times 10i^{2}
Multiply 6i times -5+10i.
6i\left(-5\right)+6\times 10\left(-1\right)
By definition, i^{2} is -1.
-60-30i
Do the multiplications. Reorder the terms.
Re(6i\left(-5\right)+6\times 10i^{2})
Multiply 6i times -5+10i.
Re(6i\left(-5\right)+6\times 10\left(-1\right))
By definition, i^{2} is -1.
Re(-60-30i)
Do the multiplications in 6i\left(-5\right)+6\times 10\left(-1\right). Reorder the terms.
-60
The real part of -60-30i is -60.
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