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GCSE Cubic Equations Questions and Answers

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Question 26 - Edexcel GCSE Foundation 2020 Past Paper 3 - Algebra, Algebraic Equations, Cubic Equations, Cubic and Reciprocal Graphs, Sketching Graphs Question By Topic

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Question 05 - Edexcel GCSE Higher 2020 Past Paper 2 - Algebra,Cubic Equations Questions By Topic

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Question 07 - OCR GCSE Foundation Sample Paper 1 - Numbers, Multiplication and Division Questions By Topic

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Question 23 - AQA GCSE Foundation Specimen Paper 1 - Algebra, Algebraic Equations, Cubic Equations, Substitution Questions By Topic

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Question 13 - OCR GCSE Higher Sample Paper 4 - Algebra, Algebraic Formulae Questions By Topic

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Question 17 R - OCR Higher Maths Past Paper 5 June 2018

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Question 09 - OCR GCSE Higher 2018 Past Paper 6 - Algebra, Algebraic Equations Questions By Topic

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Question 18 - OCR GCSE Higher 2019 Past Paper 6 - Geometry and Measures, 3D Shapes Questions By Topic

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Question 29 - AQA GCSE Higher Maths Speicmen Paper 3

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Question 20 - AQA GCSE Higher Specimen Paper 1 - Geometry and Measures, Volume & Surface Area, Questions By Topic

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Question 06 - AQA GCSE Higher Specimen Paper 1 - Algebra, Algebraic Equations Questions By Topic

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Question 15 - Edexcel GCSE Higher 2017 Past Paper 3 - Algebra, Cubic Equations Questions By Topic

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Cubic Equations - GCSE Exam

1. What are cubic equations?

Algebraic equations in which the highest power of the variable is 3 are called cubic equations.

For example:- y = x³ + 5x - 3, 2x³ + 3 = 0, y = 7x³ - x are all cubic equations. The simplest example of a cubic equation is y = x³.

2. What are cubic curves and their characteristics?

The graphs produced by cubic equations are called cubic curves. Cubic curves have two main shapes depending on the coefficient of x³.

GCSE Topicwise Cubic Equations Article Image 01

GCSE Topicwise Cubic Equations Article Image 02

Important points to remember for cubic curves:-

  1. The basic shape of the graph is determined by the highest power of the variable.
  2. Sign of the highest power (x³) determines the orientation of the graph.
  3. Putting x = 0 in the equation gives you the y-intercept.
  4. A cubic graph may have one, two, or three x-intercepts. When the equation is in the factored form (for example y = (x + a)(x + b)(x + c)), you can let y = 0 to get the x-intercepts.
  5. The points where the curve turns are the points where the gradients of the curve are zero. [to learn that please refer to the gradient of curves]

Example 1:

The graph of y = x³ - 4x - 4 is shown below.

The root of the equation x³ - 4x - 4 = 0 is p.

GCSE Topicwise Cubic Equations Article Image 03

    a) Calculate y when x = 2.

    b) Show that 2 < p < 3

    c) Find the smaller interval that contains the value of p.

GCSE Topicwise Cubic Equations Article Image 04

Example 2:

(x + b)(x - 8)(x + 5) = ax³ + cx² + dx - 80

Find the values of a, b, c and d.

GCSE Topicwise Cubic Equations Article Image 05

Quiz Questions
GCSE Topicwise Cubic Equations Article Quiz Image

GCSE Topics

  • Data Visualisation (4)
  • Algebra (1,176)
  • Ratio, Proportion and Rates of Change (443)
  • Geometry and Measures (809)
  • Statistics (274)
  • Probability (258)
  • Statistical Measures (5)
  • Numbers (1,084)
  • Frequently Asked Questions
    What are the main topics in GCSE Maths?

    The main topics in GCSE Maths are:

    • Numbers
    • Algebra 
    • Ratio, Proportion and Rates of Change 
    • Geometry and Measures
    • Statistics 
    • Probability 
    • Statistical Measures 
    • Data Visualisation 

    With regular practice of GCSE Maths topic-wise questions and GCSE Maths past pacers, you can easily score high marks.

    Is GCSE Maths hard?

    Although many people think of GCSE maths as a difficult subject, with the correct training and preparation,you can master it in time. You can practice GCSE Maths  topic-wise questions daily to improve speed, accuracy, and time and to score high marks in the GCSE Maths exam.

    What is a good grade on GCSE Maths Exam?

    A grade of 4 or 5 would be considered "good" because the government has established a 4 as the passing grade; a grade of 5 is seen as a strong pass. Therefore, anything that exceeds this level would be considered good. You can practice GCSE Maths topic-wise questions to score good grades in the GCSE Maths exam.

    How can I get full marks in GCSE Maths?

    You can get a high score in GCSE Maths through meticulous practice of GCSE Maths topic-wise questions and GCSE Maths past papers.

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