How do you multiply # (8-7i)(6-4i) # in trigonometric form?
1 Answer
Jan 27, 2018
# (8-7i)(6-4i) = 20-74i#
Explanation:
Whilst we could convert each complex number into trigonometric forms, it would be cumbersome to do so, instead we just expand the expression:
# (8-7i)(6-4i) = 8(6-4i) -7i(6-4i) #
# " " = 48-32i - 42i+28i^2 #
# " " = 48-74i -28 #
# " " = 20-74i#
