Great! Now it makes sense, and this is easy.
Hopefully, you know that the area of a rectangle is Length times Width.
The names "Length" and "Width" are not carved in stone. We could just as well say that the area of a rectangle is Base times Height, and those are the names that I will use, in this exercise.
Look at the height of the rectangle.
The height is
x + 2, right?
Look at the base.
The base is
x + ? .
Therefore, the height times the base is expressed as follows.
(x + 2) * (x + ?)
We're told that this product (i.e., the area of the rectangle) equals x^2 + 7x + 10.
So, you simply need to find the correct number to replace the ? in the following equation.
(x + 2)*(x + ?) = x^2 + 7x + 10
Please show your work or explain your reasoning, if you want more help with this exercise.
If you're lost, try looking up FOIL in your textbook's index.
Cheers ~ Mark