How do you simplify (1-2i)(3+4i)? Precalculus Complex Numbers in Trigonometric Form Complex Number Plane 1 Answer Pankaj Solanki Oct 1, 2017 11-2i Explanation: (1-2i)(3+4i) Just Multiply terms =(1)(3+4i)-2i(3+4i) =3+4i-6i-8i^2 Using Property i=sqrt-1 and i^2=-1 =3-2i+8 =11-2i 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 2195 views around the world You can reuse this answer Creative Commons License