Q. Divide the following complex numbers.5+i−23+11i
Multiply Conjugate: To divide the complex numbers (−23+11i) by (5+i), we need to multiply the numerator and the denominator by the conjugate of the denominator to remove the imaginary part from the denominator.The conjugate of (5+i) is (5−i).5+i−23+11i×5−i5−i
Multiply Numerators and Denominators: Now, we multiply the numerators together and the denominators together.Numerator: (−23+11i)(5−i)Denominator: (5+i)(5−i)
Multiply Numerators: First, we'll multiply out the numerator.(−23+11i)(5−i)=−23⋅5−23⋅(−i)+11i⋅5+11i⋅(−i)=−115+23i+55i−11i2Since i2=−1, we replace −11i2 with 11.=−115+23i+55i+11=−104+78i
Multiply Denominators: Next, we'll multiply out the denominator.(5+i)(5−i)=5⋅5+5⋅(−i)+i⋅5−i⋅i=25−5i+5i−i2Again, since i2=−1, we replace −i2 with 1.=25+1=26
Simplify Numerator and Denominator: Now we have the simplified numerator and denominator.Numerator: −104+78iDenominator: 26We divide both the real and imaginary parts of the numerator by the denominator.(−104+78i)/26
Divide by Denominator: Divide the real part and the imaginary part by 26. Real part: −104/26=−4Imaginary part: 78i/26=3iSo, the division gives us −4+3i.
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