SOLUTION: what is the equivalent to (6+3i)(6-3i) and how would u work it out??????

Question 540696: what is the equivalent to (6+3i)(6-3i) and how would u work it out??????
Found 2 solutions by mananth, josmiceli:
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
(6+3i)(6-3i)
(a+b)(a-b)=a^2-b^2
(6+3i)(6-3i)=36-9i^2
36 -9*(sqrt(-1)^2)
36-(9*-1)
36+9
=45
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
You have to use the rule

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