1,331 prompts matching "Which form of the sum formula to use when r is less than one"
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Practice: Converting between index form and logarithm form
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Show All Working: Solving a logarithmic equation and rejecting the invalid root
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Quiz: Forming a quadratic equation whose roots are given
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Show All Working: Solving a quadratic by completing the square
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Spot My Mistake: Forming an equation whose roots are alpha squared and beta squared
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Show All Working: Finding a coefficient given a stated relation between the roots
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Final Revision: Checking a symmetric-function answer by solving the equation outright
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Explain Back: Forming a cubic equation whose three roots are given
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Final Revision: Checking that the roots found satisfy the original equation
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Learn: Solving a linear inequality, and reversing the sign on dividing by a negative
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Show All Working: Solving a pair of simultaneous linear inequalities
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Spot My Mistake: Arrangements in which two particular objects must be kept apart
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Quiz: Choosing a committee of r people from n
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Explain Back: Choosing a committee with a stated number from each of two groups
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Show All Working: Counting the handshakes, or the lines joining n points
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Learn: The Pythagorean identity, sin squared plus cos squared equals one
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Show All Working: Solving a cos x plus b sin x equals c by the R method
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Learn: The distance between two points
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Show All Working: Proving two given lines perpendicular from their gradients
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Learn: The parabola y squared equals 4ax, with its focus and directrix
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