1,168 prompts matching "IGCSE Additional Maths Y10: A cubic with only one real root — Common Mistakes"
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Spot My Mistake: Forming the determinant Dx by replacing the first column
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Learn: Solving two simultaneous equations by Cramer's rule
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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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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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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Spot My Mistake: Why the inverse must be applied on the correct side
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Learn: Inertia, and what mass actually measures
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Quiz: Why mass stays the same wherever the body is taken
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Learn: Converting a weight given in kilogram-force into newtons
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Learn: The resultant of two perpendicular forces
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Spot My Mistake: The greatest and the least resultant of two given forces
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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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Learn: Choosing the point about which to take moments
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