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## Answers

15^2 = 33 + 2(xy + yz + zx)

225 - 33 = 2(xy + zy + zx)

xy + yz + zx = 96

x^3 + y^3 + z^3 - 3xyz = (x + y + z)(x^2 + y^2 + z^2 - xy - yz - zx)

= 15(33 - 96)

= -945

15^2 = 33+2(xy+yz+xz)

225 - 33 = 2(xy+yz+xz)

192/2. =xy + yz+zx

96. = xy+ yz+zx

x^3 + y^3 +z^3 - 3xyz = ( x+ y+ z)(x^2 + y^2 + z^2- xy - zx- xz)

= 15(33-96)

= 15 * -63 = - 945