756 prompts matching "Solving a cubic that must first be rearranged"
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Learn: Solving two simultaneous equations by Cramer's rule
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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Quiz: Solving three simultaneous equations with the inverse matrix
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Practice: Why the forces must sum to nought in two perpendicular directions
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Practice: Resolving three forces in two perpendicular directions
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Spot My Mistake: Why the probabilities in a distribution must sum to one
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Practice: Using a binomial expansion to approximate a number
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Practice: The sum of a complex number and its conjugate
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Practice: The argument of a complex number in the second or third quadrant
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Practice: The addition of complex numbers shown on an Argand diagram
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Practice: Converting a complex number from polar form back to a plus bi
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Spot My Mistake: The sum of the first n terms of an arithmetic progression
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Worked Example: Finding the first term and the common difference from two given terms
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Explain equal complex numbers
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Spot My Mistake: De Morgan's law that the complement of a union is the intersection of the complements
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Show All Working: Solving an equation written in terms of a binary operation
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Spot My Mistake: Squaring a bracket that contains a surd
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Show All Working: Expressing a number in the form a root b
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Common Mistakes: Solving an equation in which the unknown sits under a root
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