Oxford PAT 2015, Question 5



6 thoughts on “Oxford PAT 2015, Question 5

  1. Hi,
    I am sorry, but why were you able to just cross off the 16 from in front of the parentheses in line 3? The same applies to subtracting the 4 from the first parentheses. Doesn´t that change the results of m?


    1. The first line has a quadratic in the form ax^2 + bx +c = 0.

      The second line is equivalent to b^2 – 4ac < 0, which is the condition for the quadratic in the first line to have no real roots.

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