Let the length of the shorter piece be \( x \) feet.
According to the problem, the longer piece is 4 ft less than 4 times the length of the shorter piece. Therefore, we can express the length of the longer piece as:
\[ 4x - 4 \]
Since the total length of the board is 11 ft, we can establish the following equation:
\[ x + (4x - 4) = 11 \]
Now, simplify the equation:
\[ x + 4x - 4 = 11 \]
Combine like terms:
\[ 5x - 4 = 11 \]
Add 4 to both sides:
\[ 5x = 15 \]
Now, divide by 5:
\[ x = 3 \]
Thus, the length of the shorter piece is \( 3 \) ft.
Now, we can find the length of the longer piece:
\[ 4x - 4 = 4(3) - 4 = 12 - 4 = 8 \]
Therefore, the lengths of the pieces are:
Shorter piece: 3 ft
Longer piece: 8 ft