How do you simplify #(3+8i)(-2-i)#? Precalculus Complex Numbers in Trigonometric Form Multiplication of Complex Numbers 1 Answer Ratnaker Mehta Sep 18, 2016 #2-19i#. Explanation: The Exp.#=(3+8i)(-2-i)# #=3(-2-i)+8i(-2-i)# #=-6-3i-16i-8i^2# #=-6-19i-8(-1)# #=-6-19i+8# #=2-19i#. 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 3334 views around the world You can reuse this answer Creative Commons License