quadratic equations notes

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factorising quadratics

factorising a quadratic

  • means put into two brackets
  • (ax squared) + bx + c = 0

factorising method when a = 1

  • always rearrange into the standard format
  • write down the two brackets with the x's in (x    )(x    ) = 0
  • find 2 numbers that multiply to give c but also add/subtract to give b
  • fill in the +/- signs
  • expand the brackets to make sure they give the original equation
  • solve the euqation by setting each bracket equal to 0

when a is not 1

  • rearrange into the standard format
  • write down the initial brackets…

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