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First start by copying down the question and making sure that you have copied all of the correct numbers. We then identify that it is a quadratic equation due to there being an x raised to a power 2 term....

A reflex action is much faster than a normal, conscious movement, which enables a person to remove themselves from a dangerous stimulus much faster, to reduce the damage which would be caused if a reflex ...

Let's begin with the basics, before we begin we should be able to answer what is a surd? and What rules do we need?\begin{equation}...\end{equation}Answer: 3*sqrt{2}