1,300 prompts matching "Multiplying a surd by an integer"
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Worked Example: Forming the determinant Dy by replacing the second column
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Learn: Solving two simultaneous equations by Cramer's rule
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WAEC Prep: The minor of an entry of a 3 by 3 matrix
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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WAEC Prep: The inverse of a 2 by 2 matrix with a fractional determinant
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WAEC Prep: The inverse of a 2 by 2 matrix as one over the determinant times the adjoint
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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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WAEC Prep: How long the inverse of a 3 by 3 matrix takes, and how to shorten it
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WAEC Prep: Checking the determinant before attempting a 3 by 3 inverse
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WAEC Prep: The inverse of a 3 by 3 matrix from its adjoint and its determinant
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WAEC Prep: Simultaneous equations with fractional coefficients solved by matrix
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Learn: A space diagram and a force diagram drawn side by side
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WAEC Prep: A lamp hanging from two wires, solved by Lami's theorem
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Explain Back: Testing whether data are Poisson by comparing mean and variance
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WAEC Prep: The probability that a normal variable exceeds the mean by more than one standard deviation
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Spot My Mistake: Dividing one complex number by another using the conjugate
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WAEC Prep: A small percentage change estimated by calculus
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WAEC Prep: The work done by a constant force
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WAEC Prep: Expanding a bracket by the binomial theorem
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