You can put this solution on YOUR website! Multiply the first terms in each set of parenthesis 6x and x.
You will get
Next. multiply the outer terms in the set of parenthesis. 6x and -8.
You will get
Next, multiply the inner terms in the sets of parenthesis. -9 and x
You will get
Next, multiply the last terms in the sets of parenthesis. -9 and -8.
You will get
Now put it all together
Now combine like terms to simplify into a trinomial
I do this on paper and draw lines connecting each of the sets in order of F O I L so that I dont ever miss a step.