1,316 prompts matching "A pair that gives no real solution at all"
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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WAEC Prep: Cramer's rule applied to a pair with fractional coefficients
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Learn: Solving two simultaneous equations by Cramer's rule
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WAEC Prep: The determinant Dz in a system of three unknowns
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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Learn: The order of the steps in inverting a 3 by 3 matrix
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WAEC Prep: Reading the solution off the product of the inverse and the constants
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WAEC Prep: A three-unknown system arising from a word problem
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Learn: The component of a force along a stated direction
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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Spot My Mistake: Drawing the triangle of forces to scale to find an unknown force
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Learn: What an unclosed polygon of forces tells you
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WAEC Prep: Why friction is called a self-adjusting force
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Spot My Mistake: Why friction does not depend on the area of contact
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Spot My Mistake: The moment of a force whose line of action is not perpendicular
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WAEC Prep: The moment of two equal and opposite parallel forces
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Worked Example: The total moment of three parallel forces about one end
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Spot My Mistake: Using concurrence to find the direction of an unknown third force
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Quiz: A rod resting against a wall, and the concurrence of its three forces
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