Mathematics education uncovered and recovered

exam papers

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 […]

Tags: ,