shaniehh
  • shaniehh
help me understand this problem and how they solved it
Algebra
chestercat
  • chestercat
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shaniehh
  • shaniehh
shaniehh
  • shaniehh
anonymous
  • anonymous
( 7- 2i) (-3 -8i) First, use F.O.I.L -21 - 56i +6i +16i^2 Then, combine like terms and simplify. Remember that i^2 is equal to -1. -21 -50i + 16 (-1) = -21 -50i - 16 = -37 -50i

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Jhannybean
  • Jhannybean
use the FOIL method. First terms multiplied: \((7)(-3)\) Outer terms multiplied: \((7)(-8i)\) Inner terms multiplied: \((-3)(-2i)\) Last terms multiplied: \((-2i)(-8i)\) remember that \(i^2=-1\)
Jhannybean
  • Jhannybean
Then just add up everything you've found.

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