1,325 prompts matching "Learn: Making one unknown the subject of the linear equation"
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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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Spot My Mistake: Multiplying a 3 by 3 matrix by a 3 by 1 column
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Quiz: Solving AX equals B and XA equals B by different routes
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Spot My Mistake: A symmetric matrix, equal to its own transpose
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Worked Example: A singular matrix, and why it has no inverse
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Explain Back: Solving a matrix equation containing both a sum and a product
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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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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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Explain Back: A probability distribution table for a discrete random variable
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Explain Back: Finding n and p from a given mean and variance
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Explain Back: Converting a value to a z-score
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Worked Example: Finding a value from a given probability by working backwards
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Quiz: Writing a two-dimensional vector as a column
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Spot My Mistake: Drawing a vector as a directed line segment
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Worked Example: Testing two vectors for perpendicularity
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Worked Example: Squaring a complex number
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Quiz: Writing a complex number in polar form
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