A level History exam revision resources written by A level Examiners



This lesson looks at...

  • Squaring an expression
  • Completing the Square
  • Writing in the form (x + a)2 + b where a and b can be positive or negative
PLEASE NOTE : A small error in addition is made in the very final example, the solution should be given as

-1/2y = (x - 2)2 - 9.5    (Not - 9.4)

Resulting in

y = -2(x - 2)2 + 19

If you spot this, well done, if you don't ... wake up!

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