1,045 prompts matching "The inverse of a 2 by 2 matrix as one over the determinant times the adjoint"
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Learn: Factorising a quadratic whose coefficient of x squared is one
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Worked Example: Halving the coefficient of x and squaring it
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Show All Working: Completing the square with a fractional coefficient of x
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Quiz: A negative value of b in the quadratic formula
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Explain Back: Leaving the roots of a quadratic in surd form
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Final Revision: One root twice the other, and what that gives
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Explain Back: The value of alpha minus beta, all squared
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Common Mistakes: A symmetric function needing the sum and product twice over
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Quiz: The condition for two points of intersection
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Spot My Mistake: Finding the values of c for which a line is a tangent
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Show All Working: The point of contact when a line touches a curve
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Final Revision: The degree of the product of two polynomials
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Show All Working: Synthetic division as a shorter route
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Final Revision: Writing the result of a polynomial division out in full
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Learn: The statement of the remainder theorem
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Worked Example: The remainder on dividing by x minus 3
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Quiz: The remainder on dividing by x plus 2
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Learn: The statement of the factor theorem
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Spot My Mistake: Factorising the sum of two cubes
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Quiz: The truth value of a simple proposition
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