1,334 prompts matching "Practice: Solving an equation with a surd on each side"
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Explain Back: Showing that AB and BA are usually different for 2 by 2 matrices
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Worked Example: Taking a common factor out of a matrix
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Explain Back: The rule that the transpose of a product reverses the order
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Worked Example: A singular matrix, and why it has no inverse
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Explain Back: The order of the answer when two matrices are multiplied
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Worked Example: What a determinant of nought means for a 2 by 2 matrix
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Explain Back: The determinant of a product as the product of the determinants
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Worked Example: Evaluating a 3 by 3 determinant by the rule of Sarrus
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Explain Back: What a coefficient determinant of nought says about the system
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Worked Example: The units of mass, and the SI unit
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Explain Back: The resultant of two forces acting in the same straight line
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Explain Back: The order in which the forces are drawn round the triangle
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Explain Back: Why the total moment about any point must be nought
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Worked Example: Drawing the polygon of forces to scale
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Worked Example: The moment of a force about a point on its own line of action
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Worked Example: The total moment of three parallel forces about one end
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Explain Back: A particle hanging from two strings set at different angles
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Worked Example: The probability of no events at all in a Poisson distribution
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Explain Back: Finding n and p from a given mean and variance
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