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.
The graphs produced by cubic equations are called cubic curves. Cubic curves have two main shapes depending on the coefficient of x³.
Important points to remember for cubic curves:-
Example 1:
The graph of y = x³ - 4x - 4 is shown below.
The root of the equation x³ - 4x - 4 = 0 is p.
a) Calculate y when x = 2.
b) Show that 2 < p < 3
c) Find the smaller interval that contains the value of p.
Example 2:
(x + b)(x - 8)(x + 5) = ax³ + cx² + dx - 80
Find the values of a, b, c and d.
The main topics in GCSE Maths are:
With regular practice of GCSE Maths topic-wise questions and GCSE Maths past pacers, you can easily score high marks.
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.
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.
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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