1,305 prompts matching "Multi-part progression problem with an unknown first term"
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Explain Back: Keeping track of the nine entries when multiplying 3 by 3 matrices
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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: 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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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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Worked Example: Forming the determinant Dy by replacing the second column
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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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Worked Example: The direction of the resultant of two forces
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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Explain Back: The forces acting on a body hanging from two strings
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Worked Example: Using the sine rule on the triangle of forces
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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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Explain Back: The units of a moment, and why they are newton metres
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Worked Example: Matching each force to the sine of the angle opposite it
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