1,045 prompts matching "Find the centre and radius from x^2+y^2-6x+8y-11=0"
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Spot My Mistake: Completing the square when the roots are not real
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WAEC Prep: The minimum value of a quadratic found by completing the square
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Show All Working: Completing the square with a fractional coefficient of x
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Common Mistakes: Checking a completed square by expanding it again
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Final Revision: Why completing the square always works
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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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Final Revision: A word problem solved with the quadratic formula
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Common Mistakes: Roots that are reciprocals of one another
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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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Show All Working: Forming an equation whose roots are three alpha and three beta
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Show All Working: A simultaneous pair in which the second equation is a circle
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Common Mistakes: A word problem giving one linear and one quadratic equation
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Show All Working: The point of contact when a line touches a curve
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Final Revision: A word problem about a line and a parabola
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WAEC Prep: Expressions that are not polynomials, and why not
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Show All Working: Adding and subtracting two polynomials
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Common Mistakes: Multiplying one polynomial by another
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Final Revision: The degree of the product of two polynomials
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