1,334 prompts matching "Learn: The formula for the general term of an expansion"
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WAEC Prep: The commutative law for matrix addition
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Quiz: The zero matrix as the identity for matrix addition
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WAEC Prep: The product of a 2 by 2 matrix with the identity
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Explain Back: Showing that AB and BA are usually different for 2 by 2 matrices
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WAEC Prep: The identity matrix of order three
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Quiz: The zero matrix, and how it differs from nought in arithmetic
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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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Learn: Deciding whether a stated matrix calculation is possible at all
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WAEC Prep: Expanding a 3 by 3 determinant down a column
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Learn: Solving two simultaneous equations by Cramer's rule
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WAEC Prep: Setting out Cramer's rule for three simultaneous equations
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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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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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