pls its very very urgent
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Answer:
9 is the right answer
Step-by-step explanation:
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Answer:
( x + y + z ) ^ 3 - x^3 - y^3 - z^3 = 3 ( x + y ) ( y + z ) ( x + z )
5 ^3 - x^3 - y^3 - z^3 = 3 * 36
- x^3 - y^3 - z^3 = 108 - 125
- ( x^3 + y^3 + z^3 ) = - 17
( x^3 + y^3 + z^3 ) = 17
( x + y + z ) ^ 2 = x^2 + y^2 + z^2 + 2 ( xy + yz + xz )
5^2 = x^2 + y^2 + z^2 + 2 ( 8 )
x^2 + y^2 + z^2 = 25 - 16
= 9
x^3 + y^3 + z^3 - 3 xyz = ( x + y + z )(x^2 + y^2 + z^2 - ( xy + yz + xz ) )
17 - 3 xyz = 5 (9 - 8 )
= 5
3xyz =17 - 5
= 12
xyz = 12/ 3
= 4 (answer )
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