1,304 prompts matching "Practice: Why an identity element must work from both sides"
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WAEC Prep: Stating the order of a product before working it out
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Learn: The effect on a determinant of swapping two rows
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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Spot My Mistake: Forming the determinant Dx by replacing the first column
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Learn: Solving two simultaneous equations by Cramer's rule
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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WAEC Prep: Why the cofactor signs alternate
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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WAEC Prep: The adjoint of the identity matrix
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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WAEC Prep: A three-unknown system arising from a word problem
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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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Worked Example: Checking the solution of three equations by substitution
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Learn: Inertia, and what mass actually measures
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Worked Example: The weight of a body as mass times g
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Learn: The resultant of two perpendicular forces
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Spot My Mistake: The greatest and the least resultant of two given forces
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Quiz: Recovering the original force from its two components
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Quiz: The magnitude of the resultant of several coplanar forces
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