Evaluate
3-15i
Real Part
3
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8+2+\left(-2-8\right)i-\left(7+5i\right)
Combine the real and imaginary parts in numbers 8-2i and 2-8i.
10-10i-\left(7+5i\right)
Add 8 to 2. Add -2 to -8.
10-7+\left(-10-5\right)i
Subtract 7+5i from 10-10i by subtracting corresponding real and imaginary parts.
3-15i
Subtract 7 from 10. Subtract 5 from -10.
Re(8+2+\left(-2-8\right)i-\left(7+5i\right))
Combine the real and imaginary parts in numbers 8-2i and 2-8i.
Re(10-10i-\left(7+5i\right))
Add 8 to 2. Add -2 to -8.
Re(10-7+\left(-10-5\right)i)
Subtract 7+5i from 10-10i by subtracting corresponding real and imaginary parts.
Re(3-15i)
Subtract 7 from 10. Subtract 5 from -10.
3
The real part of 3-15i is 3.
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