1,316 prompts matching "A conjugate where the surd term comes first"
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Quiz: Solving a matrix equation of the form A plus X equals B
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Explain Back: Keeping track of the nine entries when multiplying 3 by 3 matrices
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Worked Example: The associative law for the product of three matrices
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Learn: The distributive law for a scalar over a sum of matrices
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Explain Back: Why the order of the letters matters in a matrix product
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Spot My Mistake: Orders that make a product possible one way round but not the other
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Explain Back: The rule that the transpose of a product reverses the order
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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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Learn: Deciding whether a stated matrix calculation is possible at all
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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Explain Back: Writing out the full matrix of cofactors
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Explain Back: Finding the adjoint of a 2 by 2 matrix quickly
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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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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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Learn: The order of the steps in inverting a 3 by 3 matrix
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Explain Back: The inverse of a diagonal matrix
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Explain Back: Solving two simultaneous equations by multiplying by the inverse
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Spot My Mistake: Why the inverse must be applied on the correct side
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