How do you find abs(-10 + 11i )? Precalculus Complex Numbers in Trigonometric Form Complex Number Plane 1 Answer Shwetank Mauria Apr 9, 2016 |-10+11i|=sqrt221 Explanation: |a+bi|=sqrt(a^2+b^2) Hence, |-10+11i|=sqrt((-10)^2+(11)^2)=sqrt(100+121)=sqrt221 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 1454 views around the world You can reuse this answer Creative Commons License