1,334 prompts matching "WAEC question on indices and surds"
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Quiz: Multiplying a matrix by minus one
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Spot My Mistake: Orders that make a product possible one way round but not the other
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Quiz: Solving AX equals B and XA equals B by different routes
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Quiz: The zero matrix, and how it differs from nought in arithmetic
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Practice: A diagonal matrix
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Worked Example: A singular matrix, and why it has no inverse
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Practice: The condition on the orders for a product to exist
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Learn: Deciding whether a stated matrix calculation is possible at all
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Quiz: Finding an unknown entry from a stated matrix equation
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Learn: The effect on a determinant of swapping two rows
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Learn: Solving two simultaneous equations by Cramer's rule
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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Quiz: Checking a 3 by 3 inverse by multiplication
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Spot My Mistake: Why the inverse must be applied on the correct side
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Practice: What a singular coefficient matrix says about the equations
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Quiz: Solving three simultaneous equations with the inverse matrix
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Practice: Comparing the inverse method with elimination for three equations
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Worked Example: The units of mass, and the SI unit
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Learn: Inertia, and what mass actually measures
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