Absolute Value

  • Absolute value: |x| = {x, x ≥ 0; -x, x ≤ 0)

    • makes every number inside positive

    • ex; f(2) = |x+1| = |3| = 3

    • f(2) = |x-7| = |-5| = 5

    • |ax + b| = c <-> ax + b = c OR ax+b = -c

      • ex; |2x - 3| = 1 <-> 2x - 3 = 1 OR 2x - 3 = -1

      • x = 2 OR x = 1