Question

ײ-1 / ײ + 2× + 1 =
pakek cara ya

Answer 1

X²-1 = (x-1)(x+1)
x²+2x+1 = x²+1x+1x+1
                x(x+1) 1(x+1)
                (x+1) (x+1)
jadi = (x-1)(x+1) / (x+1)(x+1), coret (x+1) atas bawah jadi hasilnya (x-1) / (x+1)