Lela Mardadi

Rearrange the quadratic into standard form: ax² + ab + c = 0

If 'a' is not 1 then divide everything by a to make it 1.

Ignore the '+ c' for the moment and just put 'ax² + ab' into brackets like so:

(a+b/2)² Remember to divide 'b' by 2

Multiply the brackets out, and compare the original to find out what extra is needed to add or subtract from the existing amount


ita GCSE not GCES

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