Factor completely.

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To factor completely, we can start by looking for a common factor in all the terms. Notice that 3 is a common factor, so we factor that out first:

Next, we need to factor the quadratic . To do this, we can either use the quadratic formula or look for two numbers that multiply to and add up to -7. The numbers -9 and 2 fit this, so we can rewrite the middle term:

Now, we can group the terms:

Factoring by grouping gives us:

Thus, we can factor out :

Putting it all together, we factor the original expression as:

So, the completely factored form of is: