# What is the domain of 7x³ + 5x²?

## I understand that the domain is like the way the line is continuing through 'x' or something similar like that but I'm not sure what the domain of this would be. Would it be all real numbers?

The Domain is the set of all possible inputs into an equation, function or expression. In this case, there are no constraints (such a dividing by zero for example) for the value of $x$ for this expression.
Therefore, the Domain is the set of all Real Numbers, or: $\left\{\mathbb{R}\right\}$