$\displaystyle (x - y)^2 + 13(x - y) + 42$
Please someone help me or something. I have no idea how to do this at all.
Like what do I do when its $\displaystyle (x - y)^2$?
I just asked my dad how to do this and he replys:
$\displaystyle (x - y)^2 - 13(x - y) + 42$
if $\displaystyle (x - y)^2 - 14(x - y) + 49$
$\displaystyle (x - y)^2 - 2*7*(x - y) + 7^2$
a =$\displaystyle (x - y)^2$
b =$\displaystyle 7$
$\displaystyle (x - y)^2 - 13(x - y) + 42
= [(x - y)^2 - 14(x - y) + 49]
={[(x - y) - 7]^2 + [(x - y) - 7]}$
$\displaystyle =(x - y -7){x - y - 7}
=(x - y - 7)(x - y - 6)$