Advanced Imaginary Numbers

Students learn to solve equations using the imaginary number "i". For example, to solve x^2 + 21 = 1, first subtract 21 from both sides to get x^2 = -20. Next, take the square root of both sides to get x = plus or minus root -20. Next, think of root -20 as root -1 times root 20, which simplifies to i times 2 root 5, or 2i root 5. So x = plus or minus 2i root 5. Students also learn to square imaginary numbers, multiply imaginary numbers, and divide imaginary numbers.



Advanced Imaginary Numbers is one of thousands of math lessons at