Q. Divide the following complex numbers.1−2i−11−3i
Multiply by conjugate: To divide complex numbers, we multiply the numerator and denominator by the conjugate of the denominator. The conjugate of (1−2i) is (1+2i).(−11−3i)/(1−2i)⋅(1+2i)/(1+2i)
Multiply numerators and denominators: Now, we multiply the numerators together and the denominators together.Numerator: (−11−3i)(1+2i)Denominator: (1−2i)(1+2i)
Multiply out the numerator: First, we'll multiply out the numerator.(−11−3i)(1+2i)=−11(1)+−11(2i)+−3i(1)+−3i(2i)=−11−22i−3i−6i2Since i2=−1, we replace −6i2 with 6.=−11−22i−3i+6=−5−25i
Multiply out the denominator: Next, we'll multiply out the denominator.(1−2i)(1+2i)=1(1)+1(2i)−2i(1)−2i(2i)=1+2i−2i−4i2Again, since i2=−1, we replace −4i2 with 4.=1−4=−3
Simplify numerator and denominator: Now we have the simplified numerator and denominator.Numerator: −5−25iDenominator: −3We divide the numerator by the denominator.−3−5−25i
Divide numerator by denominator: Divide each term in the numerator by the denominator.−5/−3=35−25i/−3=325iSo the division gives us:(35)+(325)i
More problems from Add, subtract, multiply, and divide polynomials