1,317 prompts matching "Why multiplying by the conjugate clears the surd"
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WAEC Prep: Expanding a 3 by 3 determinant down a column
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Quiz: Checking a 3 by 3 inverse by multiplication
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WAEC Prep: Simultaneous equations with fractional coefficients solved by matrix
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Learn: The resultant of two perpendicular forces
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Learn: The component of a force along a stated direction
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WAEC Prep: Drawing a clear force diagram for a body at rest
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WAEC Prep: A rigid body held in equilibrium by four forces
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Learn: Choosing the point about which to take moments
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WAEC Prep: Why friction is called a self-adjusting force
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Learn: The algebraic sum of moments when the senses differ
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WAEC Prep: Why three non-parallel forces in equilibrium must be concurrent
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WAEC Prep: A knot held in equilibrium by three strings
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Learn: The expectation of a discrete random variable
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Learn: Finding the coefficient of a stated power in an expansion
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Learn: The standard deviation of a binomial distribution
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Learn: The mean, median and mode of a normal distribution
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WAEC Prep: Comparing two values from different normal distributions by z-score
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Worked Example: Finding a value from a given probability by working backwards
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