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