1,324 prompts matching "Complete the square for x^2 - 10x + 21 = 0"
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Spot My Mistake: Multiplying a 3 by 3 matrix by a 3 by 1 column
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Quiz: Multiplying a matrix by minus one
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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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Practice: A diagonal matrix
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Practice: Evaluating AB minus BA
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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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Learn: Inertia, and what mass actually measures
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Practice: Using a binomial expansion to approximate a number
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Learn: Finding lambda from a stated mean
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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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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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