The polynomial is
![{4x}^(2) - 3x + 7](https://img.qammunity.org/2022/formulas/mathematics/high-school/rwrieuprurf75bp1exh9gy6vpih1mvlz6v.png)
- Here all the exponents of x are whole numbers, i.e, 2 and 1 are whole numbers.
- So, this polynomial is a polynomial in one variable.
- Its variable is x.
So, the given polynomial is a polynomial in one variable.
Hope you could get an idea from here.
Doubt clarification - use comment section.