In the expression $\frac{x+8}{x}$, a common mistake is to cancel the $x$ terms. Why is this incorrect?

Because $x$ is a term in the numerator, not a factor.

Because $x$ in the numerator is larger than $x$ in the denominator.

Because you must subtract terms, not cancel them.

Because simplification is only possible with numbers, not variables.

Simplifying Rational Expressions Practice — Grade 9 math