Question

factorise
1) x^3 + y^3 + 1 - 3xy
2) x^3 - y^3 + 1 + 3xy
3) 8x^3 + 64y^3 - 1252 ^3 + 120 xyz​

Answer 1

(x−1+y)(x 2+1+y 2+x+y−xy)

x 3 −1+y 3 +3xy =(x) 2 +(−1) 3 +y 3 −3×x×(−1)×y