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x² + y² = 5 masa pake logic x = 2 y = -1
x² + y² = (x+y)² -2xy
5 = 1 - 2xy
x³ + y³ = 2³-1³
= 8 -1
= 7
begitu gak sih?
= 1 -
x²+y² = (x+y)²-2xy
5 = 1-2xy
xy = -2
lanjutan
= 1+(6 x 1)
= 7