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What if my equation doesn't factorise?

For all quadratic equations, you can use the quadratic formula. Given an equation of the form ax2+bx+c, you can plug those values into this formula:

x1, x= (-b +/- sqrt(b- 4ac)) / 2a

Note: the term b- 4ac is called the determinant  and must be greater than 0 for your equation to have any solutions.

Hayden M. A Level Further Mathematics  tutor, GCSE Maths tutor, A Lev...

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