1,312 prompts matching "Learn: Deriving the quadratic formula by completing the square"
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WAEC Prep: Multiplying two 2 by 2 matrices, row into column
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Explain Back: Showing that AB and BA are usually different for 2 by 2 matrices
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Spot My Mistake: Squaring a 2 by 2 matrix
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Practice: A 2 by 2 matrix multiplied by a column vector
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WAEC Prep: Checking a single entry of a 3 by 3 product
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WAEC Prep: Multiplying two 3 by 3 matrices, row into column
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Spot My Mistake: Multiplying a 3 by 3 matrix by a 3 by 1 column
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WAEC Prep: Multiplying a matrix by a fraction
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WAEC Prep: Multiplying every entry of a matrix by a scalar
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Quiz: Multiplying a matrix by minus one
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WAEC Prep: Pre-multiplying a column vector by a matrix
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WAEC Prep: Post-multiplying a row vector by a matrix
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Quiz: Solving AX equals B and XA equals B by different routes
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WAEC Prep: Evaluating A squared minus 2A
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Worked Example: What a determinant of nought means for a 2 by 2 matrix
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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: 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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