1,033 prompts matching "Converting an answer back out of index form"
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Common Mistakes: Checking a completed square by expanding it again
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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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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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Practice: The value of alpha to the fourth plus beta to the fourth
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Common Mistakes: A symmetric function needing the sum and product twice over
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Final Revision: Using a symmetric function to find an unknown coefficient
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Learn: Making one unknown the subject of the linear equation
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Practice: Finding the matching value of the second unknown
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Spot My Mistake: A pair with equal roots, meaning one solution only
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Common Mistakes: A word problem giving one linear and one quadratic equation
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Explain Back: The condition for the line never to meet the curve
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Learn: What makes an expression a polynomial
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Worked Example: The degree of a polynomial in one variable
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Quiz: The leading term and the constant term
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Practice: Polynomial notation such as P of x
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Common Mistakes: Multiplying one polynomial by another
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Final Revision: The degree of the product of two polynomials
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Learn: The statement of the remainder theorem
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