SOLUTION: How do you write 3i(7-9i) in standard form?

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Question 369555: How do you write 3i(7-9i) in standard form?
Answer by jsmallt9(3758) About Me  (Show Source):
You can put this solution on YOUR website!
3i(7-9i)
First, use the Distributive Property to multiply:
21i+-+27i%5E2
Since i%5E2+=+-1 this becomes:
21i - 27(-1)
which simplifies to
21i + 27
Since standard form has the real part first, we'll use the Commutative Property of Addition to reorder the expression:
27 + 21i