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Nov 2020 p11 q1
311
Find the set of values of m for which the line with equation \(y = mx - 3\) and the curve with equation \(y = 2x^2 + 5\) do not meet.
Solution
To find the values of \(m\) for which the line and the curve do not meet, we set the equations equal to each other:
\(mx - 3 = 2x^2 + 5\)
Rearrange to form a quadratic equation:
\(2x^2 - mx + 8 = 0\)
For the line and the curve not to meet, the quadratic equation must have no real solutions. This occurs when the discriminant \(b^2 - 4ac\) is less than zero.