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(06) Notation: For real numbers a [0, 6] defined by f(x) = x2 -4x+4 for x E [1, 4 ]. Hint. You may, but don't have to, use the formula for the roots of the quadratic equation ax' + bx + c=0: X2 = -b+Vb2 - 4ac 2a a) Prove or Disprove: f is injective (i.e., one-to-one). b) Prove or Disprove: f is surjective (ie., onto)