Question

factor of x^3-y^3-9xy-27​

Answer 1

-27 = (-3)³

9xy = 3*x*(-y)*(-3)

x³+(-y)³+(-3)³-3*x*(-y)*(-3)

it's is in the form a³+b³+c³-3abc

= (a+b+c)(a²+b²+c²-ab-bc-ca)

a=x

b= -y

c = -3

=(x-y-3)(x²+y²+9+xy-3y+3x)