Find in the simplest form: $$ (x-3)(x+3)-x(x+1) $$

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Calculate or simplify the expression $$ (x-3)(x+3)-x(x+1) $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\left(x-3\right)\left(x+3\right)-x\left(x+1\right)$$
- step1: Expand the expression:
  $$x^{2}-9-x\left(x+1\right)$$
- step2: Expand the expression:
  $$x^{2}-9-x^{2}-x$$
- step3: Collect like terms:
  $$-9-x$$
The simplest form of the expression $$ (x-3)(x+3)-x(x+1) $$ is $$-9-x$$.
The simplest form of the expression is $$-9 - x$$.

Find in the simplest form:

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