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20 sub-topics use quadratic formula
AQA · Mathematics · 2 Algebra
3.2.3Solving equations and inequalities
zero — so each bracket is set to zero in turn. When it will not factorise, use the quadratic formula: x = ( −b ± √(b² − 4ac) ) ÷ 2a The ± is what gives the two solutions. Completing the square
in Linear and quadratic equations and 1 other section
Edexcel · Mathematics · 2 Algebra
2.3Solving equations and inequalities
zero — so each bracket is set to zero in turn. When it will not factorise, use the quadratic formula: x = ( −b ± √(b² − 4ac) ) ÷ 2a The ± is what gives the two solutions. Completing the square
in Linear and quadratic equations and 1 other section
AQA · Mathematics · 2 Algebra
3.2.1Notation, vocabulary and manipulation
data_table ab a × b The multiplication sign is dropped between letters 3y y + y + y, or 3
in Notation and vocabulary
Edexcel · Mathematics · 2 Algebra
2.1Notation, vocabulary and manipulation
data_table ab a × b The multiplication sign is dropped between letters 3y y + y + y, or 3
in Notation and vocabulary
AQA · Mathematics · 2 Algebra
3.2.2Graphs
solutions of the equation when y = 0. Deduce them algebraically by factorising or by the quadratic formula. • The y-intercept — where it crosses the y-axis, found by substituting x = 0, which is simply the constant
in Quadratic graphs and 1 other section
Edexcel · Mathematics · 2 Algebra
2.2Graphs
solutions of the equation when y = 0. Deduce them algebraically by factorising or by the quadratic formula. • The y-intercept — where it crosses the y-axis, found by substituting x = 0, which is simply the constant
in Quadratic graphs and 1 other section
AQA · Mathematics · 2 Algebra
3.2.4Sequences
Used in 17 questions on this sub-topic.
Edexcel · Mathematics · 2 Algebra
2.4Sequences
Used in 17 questions on this sub-topic.
Edexcel · Biology · 9 Ecosystems and material cycles
9.1Ecosystems and interdependence
Used in 10 questions on this sub-topic.
AQA · Biology · 4.7 Ecology
4.7.2Organisation of an ecosystem
Used in 5 questions on this sub-topic.
AQA · Biology · 4.7 Ecology
4.7.1Adaptations, interdependence and competition
Used in 5 questions on this sub-topic.
OCR · Computer Science · 2.3 Producing robust programs
2.3.1Defensive design
Used in 1 question on this sub-topic.
AQA · Mathematics · 5 Probability
3.5Probability
Used in 2 questions on this sub-topic.
Edexcel · Mathematics · 5 Probability
5.1Probability
Used in 2 questions on this sub-topic.
AQA · Mathematics · 4 Geometry and measures
3.4.2Mensuration and calculation
Used in 1 question on this sub-topic.
Edexcel · Mathematics · 4 Geometry and measures
4.2Mensuration and calculation
Used in 1 question on this sub-topic.
AQA · Physics · 4.5 Forces
4.5.3Forces and elasticity
Used in 1 question on this sub-topic.
Edexcel · Physics · 15 Forces and matter
15.1Forces and elasticity
Used in 1 question on this sub-topic.
AQA · Mathematics · 3 Ratio, proportion and rates of change
3.3Ratio, proportion and rates of change
Used in 1 question on this sub-topic.
Edexcel · Mathematics · 3 Ratio, proportion and rates of change
3.1Ratio, proportion and rates of change
Used in 1 question on this sub-topic.