How do you simplify #(-8+9i)(6+9i)#?
1 Answer
Oct 21, 2016
Explanation:
FOIL out the binomials:
#(-8+9i)(6+9i)=-48-72i+54i+81i^2#
Combining the
#=-48-18i+81i^2#
Recall that since
#=-48-18i+81(-1)#
#=-48-81-18i#
#=-129-18i#
