755 prompts matching "Checking cofactors by expanding the determinant along a second row"
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Finding the common ratio from given terms
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Sum of the first n terms of a geometric series
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Applying the sum to infinity formula when the ratio lies between minus one and one
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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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Sum of the first n odd numbers
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Explaining the difference between a sequence and a series
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Alternating sequences and their pattern
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Finding an endpoint given the midpoint
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Equation of the perpendicular bisector of a segment
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Finding where a line crosses the x-axis and y-axis
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Finding the equation of a line parallel to the x-axis or y-axis through a point
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Distance from a point to the centre of a circle
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Finding an unknown coordinate using the gradient formula
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Factorising the difference of two squares
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Factorising the sum and difference of two cubes
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Changing the subject with a square or square root
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Explaining the difference between an expression and an equation
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Worked Example: Why the square root of a non-square whole number is irrational
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Practice: Deciding whether root 16 is rational or irrational
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