1,319 prompts matching "Practice: Deciding whether root 16 is rational or irrational"
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Worked Example: The associative law for the product of three matrices
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Worked Example: Taking a common factor out of a matrix
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Worked Example: A singular matrix, and why it has no inverse
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Worked Example: What a determinant of nought means for a 2 by 2 matrix
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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Worked Example: Evaluating a 3 by 3 determinant by the rule of Sarrus
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WAEC Prep: When Cramer's rule is quicker than elimination
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Worked Example: Forming the determinant Dy by replacing the second column
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WAEC Prep: What Cramer's rule gives when the system is inconsistent
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Worked Example: Checking the solution of three equations by substitution
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Worked Example: The units of mass, and the SI unit
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WAEC Prep: The newton, and how it is defined
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Worked Example: The weight of a body as mass times g
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Worked Example: The direction of the resultant of two forces
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WAEC Prep: Why one component vanishes when the direction is chosen well
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Quiz: Recovering the original force from its two components
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Quiz: The magnitude of the resultant of several coplanar forces
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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