To factor the expression \(35x - 40\) completely, we first look for the greatest common factor (GCF) of the two terms.
The GCF of \(35x\) and \(40\) is \(5\).
Now, we can factor out \(5\) from the expression:
\[ 35x - 40 = 5(7x - 8) \]
So, the completely factored form is:
\[ 5(7x - 8) \]
Therefore, the correct response is:
5(7x−8).