1,325 prompts matching "Learn: Making one unknown the subject of the linear equation"
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Quiz: Solving a matrix equation of the form A plus X equals B
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Explain Back: Keeping track of the nine entries when multiplying 3 by 3 matrices
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Worked Example: The associative law for the product of three matrices
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Explain Back: Why the order of the letters matters in a matrix product
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Explain Back: The rule that the transpose of a product reverses the order
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Explain Back: The order of the answer when two matrices are multiplied
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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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Explain Back: Writing out the full matrix of cofactors
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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Explain Back: Finding the adjoint of a 2 by 2 matrix quickly
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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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Explain Back: The inverse of a diagonal matrix
I have just studied the inverse of a diagonal matrix in my SS3 Further Mathematics class.
Worked Example: Checking the solution of three equations by substitution
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Worked Example: The units of mass, and the SI unit
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Worked Example: The weight of a body as mass times g
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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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Spot My Mistake: The greatest and the least resultant of two given forces
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