Question

If x+y+ z = 8 and xy +yz+zx = 20 find the value of x3+y3+z3 -3xyz

Answer 1

Answer:

-24

Step-by-step explanation:

let us take,

x=2

y=2

z=4

then,

2+2+4=8

and

2x2+2x4+4x2=20

Thus,

x3+y3+z3

=2x3+2x3+4x3-3x2x2x4

=6+6+12-48

=12+12-48

=24-48

=-24.