1,324 prompts matching "Distributivity on a set of three elements"
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Worked example: finding the matrix of cofactors and the adjugate
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Spot my mistake in a Cramer's rule solution
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Common Mistakes: Showing that intersection distributes over union
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Common Mistakes: A binary operation defined by arithmetic modulo n
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WAEC Prep: Comparing the sizes of two surds without a calculator
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Common Mistakes: Solving an equation in which the unknown sits under a root
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Final Revision: Proving that root 2 is irrational
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WAEC Prep: The change of base formula for logarithms
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Show All Working: Solving a logarithmic equation and rejecting the invalid root
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Common Mistakes: Solving an exponential equation using logarithms
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Common Mistakes: Proving that a quadratic expression is positive for every real x
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Final Revision: Solving a disguised quadratic by substitution
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Show All Working: Finding a coefficient given a stated relation between the roots
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Final Revision: Checking a symmetric-function answer by solving the equation outright
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Show All Working: Solving a cubic equation by factorisation
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Common Mistakes: Adding, subtracting and multiplying two polynomials
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Worked Example: The sum of the products of the roots of a cubic taken two at a time
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Final Revision: Checking that the roots found satisfy the original equation
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Show All Working: Solving a pair of simultaneous linear inequalities
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Worked Example: The number of arrangements of n different objects in a row
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