Answer:

Step-by-step explanation:
So we have the trinomial: 

First, factor out a 2: 

Now, factor within the parentheses. 
To do so, we want to find two numbers. When multiplied, these two numbers must equal (a)(c) and when added, they must equal b
(a)(c) is 2(-5) or -10 and b is -3. So, we want two numbers that when multiplied together gives -10 and when added gives -3. 
-5 and 2 works. Therefore: 

Replace -3x with 2x and -5x: 

Factor out a 2x for the first two terms. And factor out a negative 5 for the remaining two: 

Grouping: 

And we're done!