657 prompts matching "Factorising by taking out a common factor"
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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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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Practice: Turning a minor into a cofactor with the sign rule
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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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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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Quiz: Checking a 3 by 3 inverse by multiplication
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Practice: What a singular coefficient matrix says about the equations
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Worked Example: Checking the solution of three equations by substitution
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Learn: A space diagram and a force diagram drawn side by side
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Explain Back: Why the total moment about any point must be nought
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Learn: Choosing the point about which to take moments
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WAEC Prep: A body just about to slide on a horizontal surface
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WAEC Prep: The moment of a force about the foot of a pole
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WAEC Prep: The moment of a weight about a hinge
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Worked Example: The moment of a force about a point on its own line of action
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WAEC Prep: The total moment of two forces about the same point
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