1,161 prompts matching "Checking a completed square by expanding it again"
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Spot My Mistake: Forming the determinant Dx by replacing the first 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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Explain Back: Finding the adjoint of a 2 by 2 matrix quickly
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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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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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Learn: The order of the steps in inverting a 3 by 3 matrix
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Explain Back: Solving two simultaneous equations by multiplying by the inverse
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WAEC Prep: The forces on a body suspended by a single string
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Learn: A space diagram and a force diagram drawn side by side
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WAEC Prep: A rigid body held in equilibrium by four forces
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WAEC Prep: A knot held in equilibrium by three strings
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WAEC Prep: A lamp hanging from two wires, solved by Lami's theorem
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Learn: Finding two unknown forces 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: Comparing two values from different normal distributions by z-score
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WAEC Prep: The dot product used to find the work done by a force
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WAEC Prep: Why the square root of a negative number needs i
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WAEC Prep: Multiplying a complex number by a real number
Act as my WAEC Further Mathematics coach. I am in SS 3. Take me through multiplying a comp