Quadratic formula questions …
… are usually something along the lines of:
solve 2x2 – 5x – 6 = 0
and you are asked to ‘give your answer to 2 decimal places.’ This usually means that you will need to use the quadratic formula:
However you might also get questions asking you to ‘show that.’ These will still involve using the formula, but first you must show how an area or a volume can be calculated. Once you’ve demonstrated how to calculate, you’ll then apply the formula to work out the value of x.
- Keep track of how you are answering the question by working down the page
- Remember to show all your working logically – particularly if you are calculating an area or volume
- Make sure the equation is equal to zero before you factorise
If you’d like to ask for any more detail, or you’re not sure about anything, please do ask a question in the comments section.
Quadratic equations are very useful, with all sorts of applications. Here’s a link through to ‘what use is a quadratic equation,’ if you would like to read further.
All best with your studies.
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