Factor by substitution

Factored form is refresh or reopen answer if you see weird errors in the explanation.======keep in mind this exponent property:     first factor out x from the whole expression. every term is divisible by x.    if we let  , then the following substitutions can be made        (exponent property)so applying this:       is factorable.find two integers that multiply to get 9 and add to get -6.these two integers are -3 and -3.therefore,  factors into      so applying this back in our original expression:     substitute  back in for      it factors as  .

Here are the answers to the ones that i could see.