1,334 prompts matching "Cross-multiplying to solve an equation with fractions"
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Quiz: Testing a binary operation for commutativity
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Learn: Simplifying a surd by extracting the largest perfect square
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Spot My Mistake: Squaring a bracket that contains a surd
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Final Revision: Proving that root 2 is irrational
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Spot My Mistake: The power law of logarithms
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Final Revision: Sketching the graph of a logarithmic function
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Final Revision: Solving a disguised quadratic by substitution
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Quiz: Finding alpha cubed plus beta cubed
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Learn: The sum of the roots of a cubic read from its coefficients
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Quiz: The product of the roots of a cubic
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Quiz: Solving a quadratic inequality using a sign table
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Quiz: Choosing a committee of r people from n
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Spot My Mistake: The identity that n choose r equals n choose n minus r
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Final Revision: Losing solutions by dividing through by cos x
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Spot My Mistake: The effect of c in y equals sin x plus c
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Quiz: The gradient of the line through two points
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Spot My Mistake: The general form ax plus by plus c equals nought
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Final Revision: The focus-directrix definition shared by all the conics
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Final Revision: Reading the quartiles off a cumulative frequency curve
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Quiz: The principle of moments for a body in equilibrium
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