755 prompts matching "The two middle terms when n is odd"
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Rationalising using the conjugate
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Surds arising from Pythagoras' theorem
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Sum of the first n terms of an arithmetic series
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Finding the number of terms in an arithmetic series
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Finding the nth term of a geometric sequence
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Applying the sum to infinity formula when the ratio lies between minus one and one
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Solving for x when three terms are in arithmetic progression
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Finding the first term or common difference from the sum formula
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Finding the point of intersection of two lines
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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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Changing the subject when the variable appears twice
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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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Spot My Mistake: The decimal expansion of an irrational number, and why it never repeats
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Worked Example: Adding two surds that simplify to the same root
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Spot My Mistake: Dividing one surd by another
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Learn: Why a surd is never left in the denominator
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Practice: Rationalising a denominator with a whole number multiplying the surd
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Explain Back: Simplifying the answer once the denominator is rational
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Common Mistakes: Rationalising a denominator of the form root a over root b
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