755 prompts matching "Practice: Finding the third root of a cubic when two are known"
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Final Revision: Checking a conjugate answer by multiplying back
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Spot My Mistake: Solving a surd equation that leads to a quadratic
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Common Mistakes: A surd equation that has no real solution
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Final Revision: A word problem that leads to an equation in surd form
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Learn: What a binary operation actually is
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Quiz: Evaluating a*b from a given rule
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Show All Working: Evaluating a repeated operation such as a*(b*c)
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Common Mistakes: A binary operation that is ordinary addition in disguise
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Learn: What closure means for a binary operation
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Show All Working: Showing a set is not closed by a single counter-example
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Learn: What it means for an operation to be commutative
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Spot My Mistake: Testing (a*b)*c against a*(b*c)
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Show All Working: An operation that is associative but not commutative
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Quiz: Left distributivity and right distributivity
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Spot My Mistake: Checking distributivity from two operation tables
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Show All Working: Using distributivity to simplify an expression
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Learn: What an identity element is
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Show All Working: An element with no inverse under a given operation
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Show All Working: Simplifying an expression with letters and indices
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Quiz: A negative index on a fraction, and turning it upside down
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