**3x^4**> will return

**12x^3**

and

**x^3**will return

**3x^2**

All numbers will be integers. A missing coefficient is in front of the x is 1. The exponent value will always be greater than 1.

Expressions will be in a similar format:

```
4x^7
3x^5
x^9 etc
```

Simple Derivative

Parse a basic expression and determine its derivative. Return the new value as a string. Simple expressions with positive values like **3x^4**> will return **12x^3**

and**x^3** will return **3x^2**

All numbers will be integers. A missing coefficient is in front of the x is 1. The exponent value will always be greater than 1.

Expressions will be in a similar format:

and

All numbers will be integers. A missing coefficient is in front of the x is 1. The exponent value will always be greater than 1.

Expressions will be in a similar format:

```
4x^7
3x^5
x^9 etc
```

string
math
coding