How do you multiply #2.4i(18+12i)#? Precalculus Complex Numbers in Trigonometric Form Multiplication of Complex Numbers 1 Answer Ratnaker Mehta Jul 26, 2016 #43.2i-28.8#. Explanation: The Expression #=2.4i(18+12i)# #=2.4i*18+2.4i*12i# #=43.2i+28.8i^2# #=43.2i+28.8(-1)# #=43.2i-28.8#. 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 1459 views around the world You can reuse this answer Creative Commons License