How do you factor #x^4 + 10x^2 + 9#?
1 Answer
Feb 9, 2015
Substitute
#x^4 + 10x^2 + 9# Given#u^2 + 10u +9# Substitute#u=x^2# #(u+9)(u+1)# Factor#(x^2+9)(x^2+1)# Substitute Back#u=x^2#
If you wish to continue to imaginary linear factors:
#(x+3i)(x-3i)(x+i)(x-i)# .
