if x+y+z=8 and xy+yz+zx=20 find the value of x3+y3+z3-3xyz
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x3 + y3 + z3 -3xyz
= 3( x + y + z - xyz)
= 3(8 - xyz)
= 24 - 3xyz
= 3( x + y + z - xyz)
= 3(8 - xyz)
= 24 - 3xyz
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hope it helps a lot mate....
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