628 prompts matching "Checking a conjugate answer by multiplying back"
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Quiz: Factorising a difference of two squares in order to solve it
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Spot My Mistake: Solving a quadratic that must be rearranged before factorising
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WAEC Prep: A quadratic with a repeated root
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Quiz: Completing the square on x squared plus 6x
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Spot My Mistake: Completing the square when the roots are not real
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Quiz: A negative value of b in the quadratic formula
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Spot My Mistake: What the formula gives when the discriminant is nought
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WAEC Prep: What the formula gives when the discriminant is negative
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Quiz: Finding the sum and the product without solving the equation
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Spot My Mistake: Finding a missing coefficient from a stated product of roots
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Quiz: The value of one over alpha squared plus one over beta squared
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Spot My Mistake: The value of alpha over beta plus beta over alpha
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WAEC Prep: Forming an equation whose roots are alpha plus one and beta plus one
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Quiz: Solving the quadratic that results from the substitution
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Spot My Mistake: A pair with equal roots, meaning one solution only
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WAEC Prep: A pair that gives no real solution at all
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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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WAEC Prep: Finding the values of m for which a line cuts a curve twice
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Quiz: The leading term and the constant term
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