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