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Simplify the given expression below: (−3 + 2i) ⋅ (2 + i) (2 points) −8 + i −6 + 3i −3 + 4i −1 + 2i

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4 votes

Answer: -8 + i

Proof of validity is shown below.

Simplify the given expression below: (−3 + 2i) ⋅ (2 + i) (2 points) −8 + i −6 + 3i-example-1
User Greg Viers
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8.3k points
2 votes
(-3 + 2i) × (2 + i)

Multiply this by using FOIL: First, Outside, Inside, Last.
Multiply the First numbers, -3 × 2.
Multiply the Outside numbers, -3 × i.
Multiply the Inside numbers, 2i × 2.
Multiply the Last numbers, 2i × i.

Use the distributive property to show FOIL: -3(2 + i) + 2i(2 + i).
Distribute the -3 to 2 + i and 2i to 2 + i.

Rewrite i² as -1.
-6 - 3i + 4i + 2(-1)
Now combine like terms, -6 - 2 and -3i + 4i.

-8 + i is your answer.
User Candiru
by
7.4k points

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