3/8(x-1)(x-9)

The first step for solving this expression is to distribute  through the first set of parenthesis.
 × (x - 9)
Now use the FOIL method to multiply each term in the first parenthesis by each term in the second parenthesis. This will look like the following:
x × x - x × 9 - x -  × (-9)
Remember that multiplying two negatives together equals a positive,, so the expression changes to:
x × x - x × 9 - x +  × 9
Calculate the product of all of the sets of multiplication to make the expression become:
x² - x - x +
Lastly,, calculate the difference of - x - x to find your final answer.
x² - x +
Let me know if you have any further questions.
:)