1,051 prompts matching "Roots that are reciprocals of one another"
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Quiz: Checking a 3 by 3 inverse by multiplication
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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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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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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: Why the total moment about any point must be nought
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Explain Back: A particle hanging from two strings set at different angles
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Spot My Mistake: Finding two unknown tensions from three forces in equilibrium
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Spot My Mistake: When Lami's theorem may be used, and when it may not
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Explain Back: A probability distribution table for a discrete random variable
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Explain Back: The binomial probability formula
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Quiz: The situations a Poisson distribution models
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Explain Back: Finding n and p from a given mean and variance
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Explain Back: Converting a value to a z-score
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Spot My Mistake: Reading a probability from the standard normal table
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Worked Example: Finding a value from a given probability by working backwards
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Spot My Mistake: When the normal distribution may approximate the binomial
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Worked Example: The continuity correction when approximating a discrete distribution
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