1,045 prompts matching "Practice: The addition of complex numbers shown on an Argand diagram"
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Common Mistakes: Writing down the roots once the brackets are found
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Worked Example: Halving the coefficient of x and squaring it
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Practice: Working through a quadratic by completing the square, step by step
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WAEC Prep: The minimum value of a quadratic found by completing the square
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Final Revision: Why completing the square always works
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Quiz: A negative value of b in the quadratic formula
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Practice: Giving the roots correct to two decimal places
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Explain Back: Leaving the roots of a quadratic in surd form
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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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Learn: The sum of the roots as minus b over a
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Worked Example: The product of the roots as c over a
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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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Explain Back: The value of alpha minus beta, all squared
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Spot My Mistake: The value of alpha over beta plus beta over alpha
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Common Mistakes: A symmetric function needing the sum and product twice over
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Show All Working: A simultaneous pair in which the second equation is a circle
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Spot My Mistake: Finding the values of c for which a line is a tangent
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