How do you simplify #sqrt(-25) - sqrt(-49)#? Precalculus Complex Numbers in Trigonometric Form Complex Number Plane 1 Answer Hammer Jun 22, 2018 #-2i# Explanation: The imaginary unit #i# is equal to #i=sqrt(-1)# #sqrt(-25)-sqrt(-49)=isqrt25-isqrt49=-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 2085 views around the world You can reuse this answer Creative Commons License