So yeah, I didn't pay attention in school, and now I'm self teaching. My math book gives me this equation:
(y/2+z/3) * (y/2+z/3)
My logic is as follows:
So my mid point is y^2/4 + yz/6 + yz/6 + z^2/9
Which simplifies to y^2/4 + yz/3 + z^2/9
My book OTOH tells me that the equation simplifies to y^2/4 + y^z/3 + z^2/9
Plugging in numbers for the variables leads me to...frustration I just need a brief explanation as to why the problem simplifies as it does.