1,045 prompts matching "The identity that A times its adjoint gives the determinant times the identity"
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Learn: Factorising a quadratic whose coefficient of x squared is one
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Worked Example: Factorising a quadratic whose leading coefficient is not one
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Explain Back: Finding a missing coefficient from a stated sum of roots
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Spot My Mistake: Finding a missing coefficient from a stated product of roots
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Spot My Mistake: A pair with equal roots, meaning one solution only
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Learn: What makes an expression a polynomial
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Spot My Mistake: A polynomial written in descending powers
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Spot My Mistake: Finding two coefficients from two remainder conditions
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Worked Example: Testing a list of candidates to find a factor
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Learn: Factorising a cubic into three linear factors
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Worked Example: Factorising a cubic into a linear and a quadratic factor
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Explain Back: A polynomial with a repeated linear factor
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Learn: Solving a cubic once it has been factorised
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Worked Example: How many roots a cubic equation has
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Explain Back: A cubic with a repeated root
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Learn: What makes a sentence a proposition
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Learn: How many rows a truth table needs
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Worked Example: Conjunction in a three-variable truth table
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Spot My Mistake: Building a truth table column by column
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Explain Back: Showing two statements equivalent by truth table
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