## b-rye 3 years ago Write the function as a piecewise function. f(x) = 3x + |x|

1. across

Rember |x|=x when x>=0 and -x when x<0, so you can write it like this: $f(x) = \left \{ \begin{matrix} 4x & \mbox{if }x\geq0 \\ 2x & \mbox{if }x<0\end{matrix}\right.$