What error did zacharias make?
zacharias is using the quadratic formula to solve the
equation 0 = -2x2 + 5x – 3. he begins by substituting as
shown.
quadratic formula: x=-by
the -5 should be 5.
the 52 should be -52
the 2 in the numerator should be -2.
the 2 in the denominator should be -2
2a
substitution x = -54952=42(-3)