Multiply by conjugate: To divide complex numbers, we multiply the numerator and denominator by the conjugate of the denominator. The conjugate of (1−i) is (1+i).(−1+5i)/(1−i)⋅(1+i)/(1+i)
Multiply numerators and denominators: Now, we multiply the numerators together and the denominators together.Numerator: (−1+5i)(1+i)Denominator: (1−i)(1+i)
Multiply out the numerator: First, we'll multiply out the numerator.(−1)(1)+(−1)(i)+(5i)(1)+(5i)(i)=−1−i+5i+5i2Since i2=−1, we replace 5i2 with −5.=−1−i+5i−5
Combine like terms in numerator: Now, we combine like terms in the numerator.−1−5+(−i+5i)=−6+4i
Multiply out the denominator: Next, we'll multiply out the denominator.(1)(1)+(1)(i)−(i)(1)−(i)(i)=1+i−i−i2Again, since i2=−1, we replace −i2 with 1.=1+i−i+1
Combine like terms in denominator: Now, we combine like terms in the denominator. 1+1+(i−i)=2
Divide simplified numerator by denominator: Finally, we divide the simplified numerator by the simplified denominator.(−6+4i)/2=−3+2i
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