First, you multiply the two "x's" together to get x^2.
Then, you multiply the x in the first parenthesis by the 7 in the second parenthesis to get 7x.
Next, you multiply the 9 in the first pair with the x in the second pair to get 9x.
After that, you multiply the 9 and 7 to get 63.
Put that all into equation- x^2 + 7x + 9x + 63- and simply to x^2 + 16x + 63.
Hope this helps, but hopefully this wasn't homework since I am four days late..