(y²+2y)²-1 = (y²+2y)²-1² = (y²+2y-1)(y²+2y+1) = (y+1)²(y+2y-1) = (y+1)²(y+1-√2)(y+1+√2)
y²+2y-1
D1 = (b/2)²-q = 1+1 = 2
x = -1±√2
(y²+2y)²-1 = (y²+2y)²-1² = (y²+2y-1)(y²+2y+1) = (y+1)²(y+2y-1) = (y+1)²(y+1-√2)(y+1+√2)
y²+2y-1
D1 = (b/2)²-q = 1+1 = 2
x = -1±√2