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'Proof Sorter - Quadratic Equation' printed from http://nrich.maths.org/

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Which blue statement looks like a starter?

Which line of algebra looks like it belongs with that statement?

Now look at the actions on offer : Subtract, Divide, Take and Complete. Can you find a line of algebra to go with each of those?

Is there a sequence you can find by following the algebra?

Remember, the scale at the side tells you how you are doing.