You can put this solution on YOUR website!
First, think of the expression (2x^2+8x-7) as a number, a single number. Let's call it c. The first expression is (3x-5) which can be written (a+b).
What you have is (a+b)c. This, of course, is ac + bc.
Now put back what a, b, and c stand for.
You should get
Can you do these two multiplications?
The whole thing looks like