1,235 prompts matching "A tautology used to justify a rule of algebra"
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Quiz: The zero matrix, and how it differs from nought in arithmetic
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Practice: A diagonal matrix
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Learn: Deciding whether a stated matrix calculation is possible at all
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WAEC Prep: Evaluating A squared minus 2A
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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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WAEC Prep: Expanding a 3 by 3 determinant down a column
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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Spot My Mistake: Forming the determinant Dx by replacing the first column
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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WAEC Prep: Checking the determinant before attempting a 3 by 3 inverse
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Quiz: Checking a 3 by 3 inverse by multiplication
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WAEC Prep: Simultaneous equations with fractional coefficients solved by 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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Practice: What a singular coefficient matrix says about the equations
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WAEC Prep: A three-unknown system arising from a word problem
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WAEC Prep: When the matrix method is worth the work for three unknowns
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