992 prompts matching "Explaining why sum to infinity only works for |r| < 1"
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Practice: Working through a quadratic by completing the square, step by step
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Practice: Giving the roots correct to two decimal places
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Spot My Mistake: What the formula gives when the discriminant is nought
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Learn: The sum of the roots as minus b over a
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Quiz: Finding the sum and the product without solving the equation
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Practice: The value of alpha to the fourth plus beta to the fourth
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Spot My Mistake: Finding the values of c for which a line is a tangent
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Practice: Showing that x plus 3 is a factor of a given polynomial
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Spot My Mistake: The factor theorem applied to a quartic
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Practice: Factorising a quartic as the product of two quadratics
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Quiz: Why a conditional with a false antecedent counts as true
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Learn: The biconditional, p if and only if q
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Practice: Showing that a statement is a tautology
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Practice: Modus tollens
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Quiz: Why one person is fixed in a circular arrangement
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Practice: Circular arrangements with two people together
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IGCSE Additional Maths Y11: A shaded region made of a sector and a triangle — Spot My Mistake
I am a Year 11 pupil taking Cambridge IGCSE Additional Mathematics. Work a question on a s
IGCSE Additional Maths Y11: Proving an identity by working from the harder side — Explain It Back
I am in SS 2. I have just studied proving an identity by working from the harder side for
IGCSE Additional Maths Y11: An equation that factorises into two ratios — Spot My Mistake
I am a Year 11 pupil taking Cambridge IGCSE Additional Mathematics. Work a question on an
IGCSE Additional Maths Y11: Forming numbers greater than a stated value — Spot My Mistake
I am a Year 11 pupil taking Cambridge IGCSE Additional Mathematics. Work a question on for