1,327 prompts matching "The discriminant used as the test for intersection"
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Practice: A diagonal matrix
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Practice: Evaluating AB minus BA
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Explain Back: Solving a matrix equation containing both a sum and a product
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Quiz: Finding an unknown entry from a stated matrix equation
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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Learn: Solving two simultaneous equations by Cramer's rule
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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Quiz: Checking a 3 by 3 inverse by multiplication
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Explain Back: A particle hanging from two strings set at different angles
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Practice: Using a binomial expansion to approximate a number
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Explain Back: Finding n and p from a given mean and variance
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Learn: Finding lambda from a stated mean
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Explain Back: Converting a value to a z-score
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Practice: A vector of stated magnitude in a given direction
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Practice: Equating real and imaginary parts to find two unknowns
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Practice: Why complex roots of a real quadratic come in conjugate pairs
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Practice: Differentiating x squared from first principles
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Explain Back: Differentiating one over x from first principles
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Practice: Differentiating sin x and cos x
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