1,330 prompts matching "Learn: Telling a rational number from an irrational one"
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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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Spot My Mistake: Multiplying a 3 by 3 matrix by a 3 by 1 column
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Worked Example: The associative law for the product of three matrices
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Worked Example: Taking a common factor out of a matrix
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Practice: A diagonal matrix
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Practice: The condition on the orders for a product to exist
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Practice: Evaluating AB minus BA
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Practice: Turning a minor into a cofactor with the sign rule
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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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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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Practice: Comparing the inverse method with elimination for three equations
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Worked Example: Checking the solution of three equations by substitution
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Worked Example: The weight of a body as mass times g
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Practice: The parallelogram law of forces
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Practice: Choosing the most convenient pair of directions to resolve along
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Practice: Why the forces must sum to nought in two perpendicular directions
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Worked Example: Drawing the polygon of forces to scale
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