Question

Multiply (in horizontal and vertical arrangement):

(2) (y + 4) × (y + 1)

Answer 1

(y + 4) × (y + 1)
Horizontal arrangement:
(y + 4) × (y + 1)
= (y × 4) × y + (y + 4) × 1
= y × y + 4 × y + y × 1 + 4 × 1
= y² + 4y + y + 4
= y² + 5y + 4
Vertical arrangement:
$\begin{array}{c}\begin{array}{ccccc}& & y& +& 4\end{array}\\ \begin{array}{ccccc}& \times & y& +& 1\end{array}\\ \overline{\begin{array}{ccccc}& & y& +& 4\end{array}}\\ \begin{array}{ccccc}+y^2& +& 4y& & \end{array}\\ \overline{\underline{\begin{array}{ccccc}{y}^2& +& 5y& +& 4\end{array}}}\end{array}$