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FOIL 법을 사용하여 $$$\left(1 + 3 i\right) \left(5 + i\right)$$$을(를) 곱하세요
사용자 입력
FOIL 방법을 사용하여 $$$\left(1 + 3 i\right) \left(5 + i\right)$$$을 전개하세요.
풀이
$$$\left({\color{red}\left(1\right)} + {\color{purple}\left(3 i\right)}\right) \left({\color{green}\left(5\right)} + {\color{blue}\left(i\right)}\right) = \underbrace{{\color{red}\left(1\right)} {\color{green}\left(5\right)}}_{\text{처음}} + \underbrace{{\color{red}\left(1\right)} {\color{blue}\left(i\right)}}_{\text{외부}} + \underbrace{{\color{purple}\left(3 i\right)} {\color{green}\left(5\right)}}_{\text{내부}} + \underbrace{{\color{purple}\left(3 i\right)} {\color{blue}\left(i\right)}}_{\text{마지막}} = 5 + i + 15 i - 3 = 2 + 16 i$$$
정답
$$$\left(1 + 3 i\right) \left(5 + i\right) = 2 + 16 i$$$A
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