1,334 prompts matching "An answer left in surd form after completing the square"
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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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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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Learn: Inertia, and what mass actually measures
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Practice: The value of g used in Nigerian examination papers
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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Worked Example: Using the sine rule on the triangle of forces
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Practice: Finding an unknown force from a closed polygon
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Practice: Limiting friction, and the greatest value it can reach
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Worked Example: Matching each force to the sine of the angle opposite it
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Worked Example: Finding a particular term of a binomial expansion
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Learn: Finding the coefficient of a stated power in an expansion
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Practice: Using a binomial expansion to approximate a number
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Practice: The variance of a binomial distribution as npq
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Learn: The standard deviation of a binomial distribution
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Learn: Finding lambda from a stated mean
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Worked Example: The distance between two points in three dimensions
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Learn: Subtracting one vector from another
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Practice: The dot product as the magnitudes times the cosine of the angle
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Learn: The real and the imaginary parts of a complex number
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