solve (2x-y+3z)(4x²+y²+9z²+2xy+3yz-6xz)
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[2x-y+3z][ 4x2+y2+9z2 +2xy+3yz-6xz],
Keeping that x=2x; y=-y; z=3z,
(x+y+z)(x2+y2+z2 -xy -yz -xz)= x3+y3+z3-3xyz
= (2x)3+(-y)3+(3z)3- 3(2x.-y.3z)
= 8x3- y3+ 27z3 + 18xyz
Keeping that x=2x; y=-y; z=3z,
(x+y+z)(x2+y2+z2 -xy -yz -xz)= x3+y3+z3-3xyz
= (2x)3+(-y)3+(3z)3- 3(2x.-y.3z)
= 8x3- y3+ 27z3 + 18xyz
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