755 prompts matching "IGCSE Additional Maths Y11: Checking an answer for reasonableness — Show All Wor"
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Worked Example: Which form of the sum formula to use when r is less than one
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Simplifying before substituting a value
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Coordinate geometry applied to a triangle's area check
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Solving an equation with a fractional exponent on x
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Combining index and surd notation
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Reviewing all the laws of indices before a test
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Surds in the quadratic formula
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Surd word problem: diagonal of a rectangle
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Solving a surd equation that gives an extraneous root
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Surds and indices together in one question
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Surds in a coordinate geometry distance calculation
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Finding n(A union B) using the formula
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Set theory laws: commutative and associative
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Reviewing set theory before a class test
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Deriving the arithmetic series sum formula
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Deriving the geometric series sum formula
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Finding the first term or common difference from the sum formula
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Multi-part progression problem with an unknown first term
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Explaining why sum to infinity only works for |r| < 1
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Condition for two lines to be perpendicular
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