910 prompts matching "Expanding cos of 3 theta using de Moivre's theorem"
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Final Revision: A word problem solved by factorising a quadratic
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Quiz: Completing the square on x squared plus 6x
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Practice: Working through a quadratic by completing the square, step by step
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Explain Back: An answer left in surd form after completing the square
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Spot My Mistake: Completing the square when the roots are not real
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Final Revision: Why completing the square always works
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Spot My Mistake: What the formula gives when the discriminant is nought
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Show All Working: Choosing between factorising and the formula
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Common Mistakes: A sign error in the formula, and how to catch it
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Final Revision: A word problem solved with the quadratic formula
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Quiz: Finding the sum and the product without solving the equation
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Practice: Forming an equation from a given sum and product
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Final Revision: One root twice the other, and what that gives
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Learn: What makes an expression in the roots symmetric
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Show All Working: Forming an equation whose roots are three alpha and three beta
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Common Mistakes: A symmetric function needing the sum and product twice over
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Quiz: Solving the quadratic that results from the substitution
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Spot My Mistake: A pair with equal roots, meaning one solution only
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Show All Working: A simultaneous pair in which the second equation is a circle
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Common Mistakes: A word problem giving one linear and one quadratic equation
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