How do you simplify #4(-2i)(-2i)#? Precalculus Complex Numbers in Trigonometric Form Multiplication of Complex Numbers 1 Answer Shantelle Aug 8, 2018 #-16# Explanation: #4(-2i)(-2i)# Multiply: #=-8i(-2i)# #=16i^2# We know that #i^2# equals to #-1#, so: #=16(-1)# #=-16# Hope this helps! Answer link Related questions How do I multiply complex numbers? How do I multiply complex numbers in polar form? What is the formula for multiplying complex numbers in trigonometric form? How do I use the modulus and argument to square #(1+i)#? What is the geometric interpretation of multiplying two complex numbers? What is the product of #3+2i# and #1+7i#? How do I use DeMoivre's theorem to solve #z^3-1=0#? How do I find the product of two imaginary numbers? How do you simplify #(2+4i)(2-4i)#? How do you multiply #(-2-8i)(6+7i)#? See all questions in Multiplication of Complex Numbers Impact of this question 1826 views around the world You can reuse this answer Creative Commons License