FOIL 법을 사용하여 $$$\left(8 y - 1\right) \left(y - 3\right)$$$을(를) 곱하세요

FOIL 방법을 사용하여 $$$\left(8 y - 1\right) \left(y - 3\right)$$$을 전개하세요.

$$$\left({\color{red}\left(8 y\right)} + {\color{purple}\left(-1\right)}\right) \left({\color{green}\left(y\right)} + {\color{blue}\left(-3\right)}\right) = \underbrace{{\color{red}\left(8 y\right)} {\color{green}\left(y\right)}}_{\text{처음}} + \underbrace{{\color{red}\left(8 y\right)} {\color{blue}\left(-3\right)}}_{\text{외부}} + \underbrace{{\color{purple}\left(-1\right)} {\color{green}\left(y\right)}}_{\text{내부}} + \underbrace{{\color{purple}\left(-1\right)} {\color{blue}\left(-3\right)}}_{\text{마지막}} = 8 y^{2} - 24 y - y + 3 = 8 y^{2} - 25 y + 3$$$

$$$\left(8 y - 1\right) \left(y - 3\right) = 8 y^{2} - 25 y + 3$$$A