Question

How do you write `f(x) = |x| + 3x + 1` as a piecewise function?

Answer 1

`f(x)={(4x+1color(white)("xxx")x>=0),(2x+1color(white)("xxx")x< 0):}`

Explanation:

If `x >=0` then `abs(x)=x`
and
if `x< 0` then `abs(x)=-x`