Question 634683
We factor out a 2. 

We divide 8x^4 - 50 by 2 one term at a time.

8x^4 divided by 2 = 4x^2

Then -50 divided by 2 = -25

2(4x^2 - 25) =

What lies in the parentheses is the difference of two perfect squares.

So, 4x^2 - 25 becomes (2x - 5)(2x + 5).

The final answer is three factors:

2(2x - 5)(2x + 5)