707 prompts matching "Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts"
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Common Mistakes: Rationalising when both terms of the denominator are surds
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Worked Example: Squaring both sides safely when solving a surd equation
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Final Revision: A word problem that leads to an equation in surd form
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Worked Example: Reading the symbol used for a binary operation
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WAEC Prep: Writing a binary operation rule from a description in words
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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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Worked Example: Testing the even numbers for closure under addition
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Practice: Testing a set for closure under multiplication
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Explain Back: Testing the integers for closure under division
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Final Revision: Why closure is checked before any other property
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Learn: What it means for an operation to be commutative
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Worked Example: Testing a*b against b*a for a given rule
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Explain Back: What it means for an operation to be associative
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Learn: What it means for one operation to distribute over another
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Worked Example: Testing whether star distributes over plus
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Practice: Multiplication distributing over addition in ordinary arithmetic
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Worked Example: Finding the identity element from a rule such as a*b = a + b - 3
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Practice: Why an identity element must work from both sides
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Worked Example: The law for multiplying powers of the same base
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