Here we will do more than give you the solution to 9x × 27x. We will also explain and teach
you how we came up with the answer, so you can understand it and solve similar problems in the future without help.
In this problem, 9 and 27 are the coefficients and two Xs are the variables. When a coefficient is next
to a variable there is an invisible multiplication sign. So you could rewrite the problem as follows:
9 × x × 27 × x =
So now you can multiply what are the same. You can multiply the coefficients together and the x variables together as follows:
9 × 27 = 243
x × x = x^{2}
Then you put the answers together and make the multiplication sign invisible again to get the following answer:
9x × 27x = 243x^{2}
Do you think you can do it on your own now? If so, try the next problem on our list:
What is 9x times 28x

