Luckily, this problem looks harder than it actually is, it will just take a lot of writing.
When multiplying long polynomials like this, it's often much easier to draw a rectangle, and write one polynomial along the top, and the other down the side, like this:
(Draw a rectangle. Cut it with...

The Zero Product Property states that any real number multiplied by 0, will equal zero.
When given an equation like a*b=0, either a=0, b=0, or both, in order to result in zero.
To solve your equation, you must set both factors equal to zero:
d+3/4=0 and ...

So, once you factor the left side of this equation it works out to be: (y+2)(y+1)=0
Now what do you do with this =0 part?
The Zero Product property states that when you multiply anything by 0, the answer will be zero.
So if you have an equation like a*b=0, you know that...