Multiply. Write the answer in the form $a + b i$ . $( 2 - i ) ( 5 + i )$
A) $11 - 3 i$
B) $10 - 4 i$
C) $8 - 4 i$
D) $9 + 6 i$
E) $12 - 3 i$

Name: Multiply. Write the answer in the form $a + b i$ . $( 2 - i ) ( 5 + i )$ A) $11 - 3 i$ B) $10 - 4 i$ C) $8 - 4 i$ D) $9 + 6 i$ E) $12 - 3 i$
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Question

Quizplus · Accepted Answer

To multiply $(2 - i)(5 + i)$, use the distributive property (FOIL method): $2*5 + 2*i - 5*i - i^2 = 10 + 2i - 5i - (-1) = 10 - 3i + 1 = 11 - 3i$.

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