# How do you find the equation of a cubic graph?

## How do you find the equation of a cubic graph?

If the equation is in the form y = (x − a)(x − b)(x − c) the following method should be used:

1. Find the x-intercepts by putting y = 0.
2. Find the y-intercept by putting x = 0.
3. Plot the points above to sketch the cubic curve.
4. Find the x-intercepts by putting y = 0.
5. Find the y-intercepts by putting x = 0.

## What is a cubic function example?

Examples of polynomials are; 3x + 1, x2 + 5xy – ax – 2ay, 6×2 + 3x + 2x + 1 etc. A cubic equation is an algebraic equation of third-degree. The general form of a cubic function is: f (x) = ax3 + bx2 + cx1 + d.

What is the formula of a function?

Function Formulas Function defines the relation between the input and the output. Function Formulas are used to calculate x-intercept, y-intercept and slope in any function. The slope of a linear function is calculated by rearranging the equation to its general form, f(x) = mx + c; where m is the slope.

### How do you plot a quadratic equation?

Graph Quadratic Equations in Two Variables

1. Write the quadratic equation with. on one side.
2. Determine whether the parabola opens upward or downward.
3. Find the axis of symmetry.
4. Find the vertex.
5. Find the y-intercept.
6. Find the x-intercepts.
7. Graph the parabola.

### What is a cubic function called?

A cubic function (a.k.a. a third-degree polynomial function) is one that can be written in the form. f(x) = ax3 + bx2 + cx + d. (1) Quadratic functions only come in one basic shape, a parabola. The parabola can be stretched or compressed.

How do you graph a cube root function?

This is also called horizontal shifting . The graph of the cube root function is the graph of the equation y = a (x – c) 1/3 + d Solve the above equation for x to obtain x = [ (y – d) / a ] 3 + c If c increases, x increases hence the translation to the right. If c decreases, x decreases hence the translation to the left.

## What is a cubic function graph?

Cubic Graphs. A cubic function is a polynomial of degree three. e.g. y = x 3 + 3x 2 − 2x + 5. Cubic graphs can be drawn by finding the x and y intercepts. Because cubic graphs do not have axes of symmetry the turning points have to be found using calculus.

## What is the formula for cubic function?

A cubic function is one in the form f ( x ) = a x 3 + b x 2 + c x + d .

What is the domain and range of a cubic function?

The domain and range of ANY cubic is all real numbers since any “x” value can be plugged into the cubic (there is no division by zero or square roots to worry about). Also, it turns out that cubic functions are onto functions. In other words, the range of cubic functions is all real numbers. 