1,045 prompts matching "Evaluating a 3 by 3 determinant by the rule of Sarrus"
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Quiz: Factorising a difference of two squares in order to solve it
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Common Mistakes: Writing down the roots once the brackets are found
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Common Mistakes: A sign error in the formula, and how to catch it
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Explain Back: Finding a missing coefficient from a stated sum of roots
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Spot My Mistake: Finding a missing coefficient from a stated product of roots
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Learn: What makes an expression in the roots symmetric
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Common Mistakes: A symmetric function needing the sum and product twice over
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Learn: Forming the quadratic that decides where a line meets a curve
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Common Mistakes: A line and a curve meeting once without the line being a tangent
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Practice: Polynomial notation such as P of x
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Quiz: Dividing a quartic by a quadratic
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Common Mistakes: The remainder theorem applied to a quartic
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Worked Example: Testing a list of candidates to find a factor
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Practice: Showing that x plus 3 is a factor of a given polynomial
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Common Mistakes: Using the factor theorem before dividing
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Quiz: Factorising a polynomial by grouping terms
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Spot My Mistake: Building a truth table column by column
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Learn: The conditional statement, if p then q
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Learn: The biconditional, p if and only if q
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Explain Back: Showing two statements equivalent by truth table
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