1) Put it into standard format.
2) Decide what a, b and c are.
3) Substitute these values into the formula.
Whenever you get a minus value alarm bells should ring.
4) Type into calculator and get positive and negitive answer.
Check answer by substituting back into the equations angain.
Remember these things:
It is `2a` on the bottom of the fraction.
If I get a negitive number in the square root, im wrong. no negative roots at GCSE level.
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