1,324 prompts matching "Closure on a set of three elements under a stated rule"
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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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WAEC Prep: A matrix expression with brackets to expand
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Explain Back: Solving a matrix equation containing both a sum and a product
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WAEC Prep: Expanding a 3 by 3 determinant along the first row
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Practice: The sign pattern of the cofactors in a 3 by 3 determinant
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WAEC Prep: When Cramer's rule is quicker than elimination
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WAEC Prep: Cramer's rule applied to a pair with fractional coefficients
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Worked Example: Forming the determinant Dy by replacing the second column
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WAEC Prep: What Cramer's rule gives when the system is inconsistent
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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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Learn: The order of the steps in inverting a 3 by 3 matrix
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WAEC Prep: Simultaneous equations with fractional coefficients solved by matrix
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WAEC Prep: Writing two simultaneous equations as a single matrix equation
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Explain Back: Solving two simultaneous equations by multiplying by the inverse
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WAEC Prep: The newton, and how it is defined
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Practice: The parallelogram law of forces
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WAEC Prep: Two forces acting in opposite directions
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Learn: The resultant of two perpendicular forces
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