## Curious case of an error in an exam paper

Here is a question from A level Edexcel Core 1 January 2013 paper: The equation \( (k+3) x^2+6x+k=5 \) where \( k\) is a constant, has two distinct real solutions for \(x\). Show that \( k\) satisfies \( k^2-2k-24<0 \) Hence find the set of possible values of \( k\). This is a question of […]