Home > Precalculus > Multiplication of Complex Numbers

How do you evaluate #(1+ 3i ) - ( 5+ 9i )#?

Answer 1

Chloe Alexander

#-4-6i#

1) Remove brackets: #1+3i-5-9i#

2) Add real numbers to real numbers and complex numbers to complex numbers: #-4-6i#

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 2

Sadie Alexander

#-4-6i#

Just separate real & imaginary parts & add/subtract them as follows

#(1+3i)-(5+9i)#

#=1+3i-5-9i#

#=1-5+3i-9i#

#=-4-6i#

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 3

Elias Ackerman

To evaluate ((1 + 3i) - (5 + 9i)), you simply subtract the real parts and the imaginary parts separately.

Real part: (1 - 5 = -4)

Imaginary part: (3i - 9i = -6i)

So, the result is (-4 - 6i).

By signing up, you agree to our Terms of Service and Privacy Policy

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.