1,334 prompts matching "Adding or subtracting the same number on both sides"
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Quiz: The zero matrix, and how it differs from nought in arithmetic
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Practice: A diagonal matrix
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Worked Example: A singular matrix, and why it has no inverse
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WAEC Prep: Evaluating 2A plus 3B for two given matrices
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Quiz: Finding an unknown entry from a stated matrix equation
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Worked Example: What a determinant of nought means for a 2 by 2 matrix
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Explain Back: The determinant of a product as the product of the determinants
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Learn: Solving two simultaneous equations by Cramer's rule
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Explain Back: What a coefficient determinant of nought says about the system
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Explain Back: Finding the adjoint of a 2 by 2 matrix quickly
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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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Quiz: Checking an inverse by multiplying to get the identity
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Quiz: Checking a 3 by 3 inverse by multiplication
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WAEC Prep: A three-unknown system arising from a word problem
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WAEC Prep: Resolving before compounding several forces
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WAEC Prep: Drawing a clear force diagram for a body at rest
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Learn: A space diagram and a force diagram drawn side by side
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WAEC Prep: A rigid body held in equilibrium by four forces
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