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 of […]

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