Question #87c3e Precalculus Complex Numbers in Trigonometric Form Complex Number Plane 1 Answer eduarchitect · Stefan V. Jul 25, 2017 #14+28i# Explanation: #3(7+7i) =21+21i# #i(7+7i) = 7i-7# Then: #21+21i + 7i-7 = 14+28i# Answer link Related questions What is the complex number plane? Which vectors define the complex number plane? What is the modulus of a complex number? How do I graph the complex number #3+4i# in the complex plane? How do I graph the complex number #2-3i# in the complex plane? How do I graph the complex number #-4+2i# in the complex plane? How do I graph the number 3 in the complex number plane? How do I graph the number #4i# in the complex number plane? How do I use graphing in the complex plane to add #2+4i# and #5+3i#? How do I use graphing in the complex plane to subtract #3+4i# from #-2+2i#? See all questions in Complex Number Plane Impact of this question 1313 views around the world You can reuse this answer Creative Commons License