1,334 prompts matching "Expressing the answer in the form a plus b root c"
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Worked Example: Taking a common factor out of a matrix
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Learn: The distributive law for a scalar over a sum of matrices
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Practice: The transpose of a 2 by 3 matrix
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Worked Example: A singular matrix, and why it has no inverse
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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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Explain Back: Solving a matrix equation containing both a sum and a product
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Worked Example: What a determinant of nought means for a 2 by 2 matrix
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Learn: Solving two simultaneous equations by Cramer's rule
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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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Worked Example: The units of mass, and the SI unit
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Learn: Inertia, and what mass actually measures
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Worked Example: The weight of a body as mass times g
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Learn: Converting a weight given in kilogram-force into newtons
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Practice: The parallelogram law of forces
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Worked Example: The direction of the resultant of two forces
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Learn: The resultant of two perpendicular forces
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Learn: The component of a force along a stated direction
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Practice: The direction of the resultant of several coplanar forces
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Explain Back: Showing that a system of concurrent forces is in equilibrium
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