gistfile1.txt

a^2 = ?

let a = 50 - b
just for fun cuz we can. see below

then
b = 50 - a

then
a^2 = (50 - b)^2
    = 2500 + b^2 -100b
    = 100(25 - b) + b^2

but wtf 50?
cuz we want 2uv in (u+v)^2 to give 100v
easier to calculate with powers of 10