 # Equation Calculator

Equation Calculator is a free online tool that can solve a given equation for a given variable. Protonstalk Equation Calculator is one such handy and helpful tool to compute equations faster and easier.

### Inputs

Following are the inputs of the calculator.

1. Equation
2. Variable for which equation is to be solved

### Steps to use

Step 1: Enter the equation and the variable you want to solve the equation for in the respective text field.
Step 2: Click on the “calculate” button to compute the value.
Step 3: The required answer with a graph will be displayed in a new window.

### Output

Following are the outputs of the calculator

1. Input interpretation
2. Results
3. Root Plot i.e a graph of the equation showing the roots as intersecting points on x-axis

## Equations

An equation is a statement that states the equality of two expressions that are connected by the equals sign “=”. Simply, an equation is written as two operands connected by an operator (“=”). Solving any equation involves determining which values of the variables make the equality true.

## Types of Equations

There are a lot of types of equations, some of them are

• Linear Equation
• Cubic equations
• Polynomial Equation
• Functional Equation
• Parametric Equation and so on.

## Example

Question: Solve x2 +4x – 5 = 0

Solution: Given equation, x2 +4x – 5 = 0

Splitting the x term so that we can factorise it.
x2 + 5x – x – 5 = 0

Factorising the equation
x(x + 5) – 1(x+5) = 0

Now we know that either x-1 should be 0 or x+5 should be
(x-1)(x+5) =0

So, x -1 = 0 or x + 5 = 0
=> x = 1 or x = -5

So the solution is x = 1 or -5

More Mathematical Calculators

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