1,334 prompts matching "Practice: Finding n when the sum of an arithmetic progression is given"
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WAEC Prep: Reading the order of a matrix as rows by columns
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Practice: The condition on the orders for a product to exist
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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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WAEC Prep: When Cramer's rule is quicker than elimination
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Spot My Mistake: Forming the determinant Dx by replacing the first column
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WAEC Prep: What Cramer's rule gives when the system is inconsistent
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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WAEC Prep: The cofactor of a corner entry
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WAEC Prep: Why the cofactor signs alternate
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WAEC Prep: The adjoint of the identity matrix
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Quiz: Checking an inverse by multiplying to get the identity
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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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Learn: The order of the steps in inverting a 3 by 3 matrix
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Practice: What a singular coefficient matrix says about the equations
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WAEC Prep: When the matrix method is worth the work for three unknowns
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Quiz: Solving three simultaneous equations with the inverse matrix
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Practice: Comparing the inverse method with elimination for three equations
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Worked Example: Checking the solution of three equations by substitution
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WAEC Prep: The weight of a body on the moon compared with on earth
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