1,326 prompts matching "Rationalising the denominator when it's a surd minus a surd"
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Explain Back: Keeping track of the nine entries when multiplying 3 by 3 matrices
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Quiz: The zero matrix, and how it differs from nought in arithmetic
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Explain Back: The order of the answer when two matrices are multiplied
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WAEC Prep: The determinant of a 2 by 2 matrix as ad minus bc
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WAEC Prep: What Cramer's rule gives when the system is inconsistent
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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Quiz: Checking an inverse by multiplying to get the identity
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WAEC Prep: When the matrix method is worth the work for three unknowns
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Quiz: Solving three simultaneous equations with the inverse matrix
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WAEC Prep: Why one component vanishes when the direction is chosen well
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Quiz: Recovering the original force from its two components
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Quiz: The magnitude of the resultant of several coplanar forces
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Learn: The algebraic sum of moments when the senses differ
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Quiz: A rod resting against a wall, and the concurrence of its three forces
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Spot My Mistake: Why the probabilities in a distribution must sum to one
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Spot My Mistake: The probability of exactly r successes in n trials
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Quiz: The situations a Poisson distribution models
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Quiz: The area under the normal curve, and what it represents
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Spot My Mistake: The proportion of a normal distribution within one, two and three standard deviations
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Spot My Mistake: Reading a probability from the standard normal table
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