584 prompts matching "Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted"
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Solving simultaneous linear equations by elimination
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Changing the subject with a square or square root
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Simplifying an expression with brackets and indices together
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Factorising a quadratic with a coefficient in front of x squared
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Cross-multiplying to solve an equation with fractions
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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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Common Mistakes: Why a rational number added to an irrational one stays irrational
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Practice: Collecting similar surds in an expression
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Explain Back: Why 2 root 3 and 5 root 3 count as similar surds
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Explain Back: Multiplying root a by root b
I have just studied multiplying root a by root b in my SS1 Further Mathematics class. Let
Show All Working: Checking a rationalised answer by decimal approximation
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Practice: Rationalising a denominator of the form a plus root b over c minus root d
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Learn: Solving an equation with a single square root term
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Practice: A binary operation set out as a table
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Practice: Testing a set for closure under multiplication
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Show All Working: Showing a set is not closed by a single counter-example
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Practice: Multiplication distributing over addition in ordinary arithmetic
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Explain Back: Showing distributivity fails by a counter-example
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Common Mistakes: Checking an inverse by working the operation both ways
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