1,334 prompts matching "Quiz: A negative value of b in the quadratic formula"
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Worked Example: Forming the determinant Dy by replacing the second column
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WAEC Prep: What Cramer's rule gives when the system is inconsistent
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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WAEC Prep: Checking the determinant before attempting a 3 by 3 inverse
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Explain Back: Solving two simultaneous equations by multiplying by the inverse
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Spot My Mistake: Why the inverse must be applied on the correct side
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Practice: What a singular coefficient matrix says about the equations
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Practice: Comparing the inverse method with elimination for three equations
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WAEC Prep: The newton, and how it is defined
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WAEC Prep: The forces on a body resting on a rough horizontal plane
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WAEC Prep: The forces on a body suspended by a single string
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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Explain Back: The forces acting on a body hanging from two strings
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Explain Back: The order in which the forces are drawn round the triangle
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WAEC Prep: The two conditions for a rigid body to be in equilibrium
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Practice: Why the forces must sum to nought in two perpendicular directions
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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: Friction, and the direction in which it acts
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