Part a: factor 2x^2b^2 + 5xb^2 + 2b^2. show your work.
part b: factor x^2 − 8x + 16. show your work.
part c: factor x^2 − 49. show your work.

The first one is the only that might give you some trouble. The first thing you do is factor out the :

and then you have to factor the rest using the quadratic formula.  The whole thing factored looks like this, then:

The second one can be factored straight out:
(x-4)(x-4)
Then the third one can be factored by taking roots.  Recognize that is a perfect square and so is 49:

and taking the square root of both sides gives you this:
x = +/- 7

The answer is