Q. Divide the following complex numbers.−3−2i−9−6i
Multiply numerator by conjugate: To divide the complex numbers (−9−6i) by (−3−2i), 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 (−3−2i) is (−3+2i).
Simplify the multiplication: Multiply the numerator (−9−6i) by the conjugate of the denominator (−3+2i).(−9−6i)×(−3+2i)=(−9×−3)+(−9×2i)+(−6i×−3)+(−6i×2i)
Replace i2 and simplify: Simplify the multiplication.(−9×−3)+(−9×2i)+(−6i×−3)+(−6i×2i)=27−18i+18i−12i2Remember that i2=−1.
Multiply denominator by conjugate: Replace i2 with −1 and simplify the expression.27−18i+18i−12(−1)=27+12=39The imaginary parts cancel out: −18i+18i=0
Simplify the multiplication: Now, multiply the denominator (−3−2i) by its conjugate (−3+2i).(−3−2i)×(−3+2i)=(−3×−3)+(−3×2i)+(−2i×−3)+(−2i×2i)
Obtain simplified numerator and denominator: Simplify the multiplication.(−3×−3)+(−3×2i)+(−2i×−3)+(−2i×2i)=9−6i+6i−4i2Again, replace i2 with −1.
Divide numerator by denominator: Replace i2 with −1 and simplify the expression.9−6i+6i−4(−1)=9+4=13The imaginary parts cancel out: −6i+6i=0
Divide numerator by denominator: Replace i2 with −1 and simplify the expression.9−6i+6i−4(−1)=9+4=13The imaginary parts cancel out: −6i+6i=0 Now we have the simplified numerator and denominator.The numerator is 39 and the denominator is 13.Divide the numerator by the denominator to get the final result.39/13=3
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