Hard · Complex Numbers

Hard Complex Numbers Questions

This page lists the 7 hard-difficulty questions on Complex Numbers, one row per record in the site's question bank (data/questions.json), with each question's score band.

By score band: 600-700 1 of 7, 700-800 6 of 7. The Complex Numbers topic page carries all 25 questions on this topic; the other difficulty hubs are easy, medium and hard.

Question	Band
What is the product (1 - 1i)(-2 + 1i) expressed in the form a + bi?	600-700	Open
What is the product (4 - 1i)(4 + 5i) expressed in the form a + bi?	700-800	Open
What is the product (-1 - 1i)(-3 - 1i) expressed in the form a + bi?	700-800	Open
What is the product (1 - 5i)(5 - 4i) expressed in the form a + bi?	700-800	Open
What is the product (-2 - 6i)(-6 + 1i) expressed in the form a + bi?	700-800	Open
What is the product (5 - 2i)(-3 + 4i) expressed in the form a + bi?	700-800	Open
What is the product (1 - 5i)(1 - 1i) expressed in the form a + bi?	700-800	Open