1,314 prompts matching "Practice: Reversing the sign when multiplying by a negative number"
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Practice: A diagonal matrix
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Practice: Evaluating AB minus BA
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Worked Example: What a determinant of nought means for a 2 by 2 matrix
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WAEC Prep: Expanding a 3 by 3 determinant down a column
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WAEC Prep: When Cramer's rule is quicker than elimination
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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: Simultaneous equations with fractional coefficients solved by matrix
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Spot My Mistake: Why the inverse must be applied on the correct side
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Quiz: Solving three simultaneous equations with the inverse matrix
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Quiz: Why mass stays the same wherever the body is taken
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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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Learn: A space diagram and a force diagram drawn side by side
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Spot My Mistake: Drawing the triangle of forces to scale to find an unknown force
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WAEC Prep: A rigid body held in equilibrium by four forces
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Practice: Finding an unknown force from a closed polygon
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Quiz: The coefficient of friction between two surfaces
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Spot My Mistake: Why friction does not depend on the area of contact
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