How do you simplify #(5-4i)(3+6i)#?
1 Answer
Feb 5, 2016
39 + 18i
Explanation:
distribute the brackets using FOIL
# (5-4i)(3+6i) = 15 + 30i - 12i - 24i^2 # [ remember that
# i^2 = (sqrt-1)^2 = -1 # ]
# 15+30i-12i + 24 = 39 + 18i #
