\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
For \(f:x\mapsto 1-3x\), find in simplest form:
  1. \(f(-2)=\)
  2. \(f(3)=\)
  3. \(f(x+1)=\)
  4. \(f(x^2)=\)