252 prompts matching "Expanding a 3 by 3 determinant down a column"
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Common Mistakes: Expanding the product of two surd brackets
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Show All Working: Checking a rationalised answer by decimal approximation
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Worked Example: Why multiplying by the conjugate clears the surd
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Final Revision: Checking a conjugate answer by multiplying back
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Show All Working: Showing a set is not closed by a single counter-example
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Explain Back: Showing distributivity fails by a counter-example
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Common Mistakes: Checking an inverse by working the operation both ways
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Quiz: A negative index on a fraction, and turning it upside down
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Learn: Solving an equation by writing both sides to the same base
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Common Mistakes: An indicial equation solved by substitution
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Final Revision: Checking an indicial solution by substitution
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Quiz: Evaluating log to base 3 of 7 by change of base
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WAEC Prep: Solving an exponential equation by taking logarithms of both sides
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Spot My Mistake: A sequence defined by a recurrence relation
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Common Mistakes: Proving the sum formula by pairing the terms
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Final Revision: A savings problem modelled by an arithmetic progression
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Spot My Mistake: A compound interest problem modelled by a geometric progression
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WAEC Prep: A population growth problem modelled by a geometric progression
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Quiz: Multiplying both sides by a positive number
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Practice: Reversing the sign when multiplying by a negative number
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