416 prompts matching "Squaring both sides safely when solving a surd equation"
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Quiz: The zero matrix as the identity for matrix addition
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Spot My Mistake: Why matrix subtraction is not commutative
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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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Spot My Mistake: Orders that make a product possible one way round but not the other
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Spot My Mistake: A symmetric matrix, equal to its own transpose
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Quiz: The zero matrix, and how it differs from nought in arithmetic
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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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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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Quiz: Checking an inverse by multiplying to get the identity
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Quiz: Checking a 3 by 3 inverse by multiplication
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Quiz: Why mass stays the same wherever the body is taken
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Spot My Mistake: Compounding three forces acting at one point
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Spot My Mistake: The greatest and the least resultant of two given forces
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Quiz: Recovering the original force from its two components
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Quiz: The magnitude of the resultant of several coplanar forces
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Spot My Mistake: Drawing the triangle of forces to scale to find an unknown force
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