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©G Dear2008 – Not to be sold/Free to use
Mathematic (Preliminary) Equations Quadratic Formula Stage 6 - Year 12 Press Ctrl-A ©G Dear2008 – Not to be sold/Free to use
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This method is often the last resort.
Equations Solving by Formula This method is often the last resort. Formula For ax2 + bx + c = 0 -b ±√b2 - 4ac 2a x =
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Equations Example -b ±√b2 - 4ac 2a x = For x2 + 4x + 2 = 0 a = 1,
-4 ±√8 2 x = -4 ±2√2 2 = -2 ±√2 =
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Equations Example -b ±√b2 - 4ac 2a x = For 3x2 - 5x + 1 = 0 a = 3,
5 ±√13 6 x =
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