1,334 prompts matching "Adding or subtracting the same number on both sides"
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Worked Example: Evaluating a 3 by 3 determinant by the rule of Sarrus
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Spot My Mistake: Forming the determinant Dx by replacing the first column
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WAEC Prep: Setting out Cramer's rule for three simultaneous equations
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WAEC Prep: The cofactor of a corner entry
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WAEC Prep: Why the cofactor signs alternate
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WAEC Prep: The minor of an entry of a 3 by 3 matrix
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Practice: Turning a minor into a cofactor with the sign rule
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Explain Back: Writing out the full matrix of cofactors
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WAEC Prep: The order in which the cofactors are transposed
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WAEC Prep: The adjoint as the transpose of the matrix of cofactors
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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WAEC Prep: Checking the determinant before attempting a 3 by 3 inverse
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Learn: The order of the steps in inverting a 3 by 3 matrix
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Explain Back: The inverse of a diagonal matrix
I have just studied the inverse of a diagonal matrix in my SS3 Further Mathematics class.
Explain Back: Solving two simultaneous equations by multiplying by the inverse
I have just studied solving two simultaneous equations by multiplying by the inverse in my
Practice: What a singular coefficient matrix says about the equations
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WAEC Prep: When the matrix method is worth the work for three unknowns
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Quiz: Solving three simultaneous equations with the inverse matrix
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WAEC Prep: A particle, and what the word assumes
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WAEC Prep: A rigid body, and what the word assumes
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