1,292 prompts matching "Substituting values into an algebraic expression"
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Practice: The sign pattern of the cofactors in a 3 by 3 determinant
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Worked Example: Evaluating a 3 by 3 determinant by the rule of Sarrus
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WAEC Prep: When Cramer's rule is quicker than elimination
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WAEC Prep: Setting out the coefficient determinant for two simultaneous equations
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Spot My Mistake: Forming the determinant Dx by replacing the first column
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Worked Example: Forming the determinant Dy by replacing the second column
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Learn: Solving two simultaneous equations by Cramer's rule
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WAEC Prep: The determinant Dz in a system of three unknowns
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WAEC Prep: Setting out Cramer's rule for three simultaneous equations
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Explain Back: What a coefficient determinant of nought says about the system
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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WAEC Prep: The minor of an entry of a 3 by 3 matrix
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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WAEC Prep: The order in which the cofactors are transposed
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WAEC Prep: The adjoint as the transpose of the matrix of cofactors
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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WAEC Prep: The inverse of a 2 by 2 matrix with a fractional determinant
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WAEC Prep: The inverse of an inverse
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WAEC Prep: The inverse of a 2 by 2 matrix as one over the determinant times the adjoint
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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