Homework Answers
a)
(-3+5i) -(-9-8i)
= -3 +5i +9 +8i
= (-3 +9) +(5+8)i
= 6 +13i
b)
(-3+5i)(-9-8i)
= 27 +24i -45i -40i²
Use i²= -1
= 27 -21i -40(-1)
=27 -21i +40
=67 -21 i
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With explanation please.
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