1,334 prompts matching "An answer left in surd form after completing the square"
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Learn: Choosing the point about which to take moments
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Worked Example: Drawing the polygon of forces to scale
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Learn: What an unclosed polygon of forces tells you
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Worked Example: The moment of a force about a point on its own line of action
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Explain Back: Locating the point of concurrence on a diagram
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Practice: Resolving three forces in two perpendicular directions
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Learn: Finding two unknown forces by Lami's theorem
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Learn: The expectation of a discrete random variable
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Practice: The probability of exactly r events in a Poisson distribution
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Worked Example: The probability of no events at all in a Poisson distribution
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Learn: The mean, median and mode of a normal distribution
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Explain Back: Converting a value to a z-score
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Worked Example: Finding a value from a given probability by working backwards
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Practice: Using the normal tables when the z-score is negative
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Worked Example: The continuity correction when approximating a discrete distribution
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Practice: The components of a vector given its magnitude and direction
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Learn: The coordinates of a point in three dimensions
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Worked Example: Finding the unit vector in the direction of a given vector
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Learn: The unit vectors i, j and k
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Practice: A vector of stated magnitude in a given direction
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