SOLUTION: I need help on this problem please: (5-4i) and it has the squared sign outside the parentheses by the 4i.Thanks for your help in advance LH and have a great day!

Algebra ->  Radicals -> SOLUTION: I need help on this problem please: (5-4i) and it has the squared sign outside the parentheses by the 4i.Thanks for your help in advance LH and have a great day!      Log On


   

Question 131966: I need help on this problem please: (5-4i) and it has the squared sign outside the parentheses by the 4i.Thanks for your help in advance LH and have a great day!
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Simplify:
%285-4i%29%5E2 Use the FOIL method to multiply.
%285-4i%29%285-4i%29+=+25-20i-20i%2B16i%5E2 Combine like-terms.
25-40i%2B16i%5E2 Replace i%5E2 with its equivalent, -1
25-40i%2B16%28-1%29 Simplify.
25-40i-16+=+9-40i