1,045 prompts matching "Learn: Swapping and negating the entries when inverting a 2 by 2 matrix"
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Worked Example: Halving the coefficient of x and squaring it
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Learn: Deriving the quadratic formula by completing the square
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Worked Example: Substituting a, b and c into the quadratic formula correctly
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Show All Working: Choosing between factorising and the formula
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Common Mistakes: A sign error in the formula, and how to catch it
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Learn: The sum of the roots as minus b over a
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WAEC Prep: Checking the sum and product against the solved roots
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Final Revision: One root twice the other, and what that gives
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Learn: What makes an expression in the roots symmetric
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Worked Example: The identity linking alpha squared plus beta squared to the sum and product
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Common Mistakes: A symmetric function needing the sum and product twice over
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Learn: Making one unknown the subject of the linear equation
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Worked Example: Substituting into the quadratic and tidying up
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Learn: Forming the quadratic that decides where a line meets a curve
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Common Mistakes: A line and a curve meeting once without the line being a tangent
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Learn: Setting out the division of a cubic by a linear expression
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Common Mistakes: The degree of the quotient and of the remainder
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Learn: The statement of the remainder theorem
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Explain Back: Finding a coefficient when the remainder is given
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Learn: The statement of the factor theorem
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