755 prompts matching "The discriminant used as the test for intersection"
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Final Revision: Simplifying a fraction whose numerator and denominator are both surds
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Worked Example: Rationalising a denominator that is a single surd
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Final Revision: Checking a conjugate answer by multiplying back
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Learn: Solving an equation with a single square root term
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Worked Example: Squaring both sides safely when solving a surd equation
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Practice: Solving an equation with a surd on each side
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Spot My Mistake: Solving a surd equation that leads to a quadratic
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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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Spot My Mistake: A binary operation defined on a set of three elements
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Spot My Mistake: Reading closure off an operation table
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Quiz: Reading commutativity off a symmetrical operation table
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Practice: An operation that is not commutative, with a counter-example
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Quiz: Left distributivity and right distributivity
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Practice: Multiplication distributing over addition in ordinary arithmetic
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Explain Back: Showing distributivity fails by a counter-example
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Spot My Mistake: Checking distributivity from two operation tables
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Learn: What an identity element is
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Practice: Why an identity element must work from both sides
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Explain Back: What an inverse element is
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