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Algebra Formulae

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Question
Medium

What is the quadratic formula?

Hint:

For ax2+bx+c=0ax^2 + bx + c = 0.

SubtopicQuadratics
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Edexcel GCSE Mathematics

Algebra FormulaeComplete deck

  1. 01·Quadratics

    What is the quadratic formula?

    Answer

    x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
  2. 02·Quadratics

    Simplify 2x+3x2x + 3x

    Answer

    5x5x

  3. 03·Quadratics

    Factorise x2−9x^2 - 9

    Answer

    (x−3)(x+3)(x-3)(x+3) — a difference of two squares.

  4. 04·Quadratics

    Solve the quadratic equation x2−5x+6=0x^2 - 5x + 6 = 0.

    Answer

    Using factorisation:

    x2−5x+6=(x−2)(x−3)x^2 - 5x + 6 = (x-2)(x-3)

    Therefore, x=2x=2 or x=3x=3.

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