If m+n=3 and m^2+N^2=6 find the numerical value for m^3+N^3
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Another approach . . .
If and ,
find the numerical value for
We are given: .
Square (1): .
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Substitute (2): .
Cube (1): .
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
Substitute (3) and (1): .
Therefore: .