√5 atau -√5
Penjelasan dengan langkah-langkah:
x² + y² = (x - y)² + 2xy
(x - y)² = (x² + y²) - 2xy
= 15 - 2 x 5
= 15 - 10
= 5
x - y = ±√5
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√5 atau -√5
Penjelasan dengan langkah-langkah:
x² + y² = (x - y)² + 2xy
(x - y)² = (x² + y²) - 2xy
= 15 - 2 x 5
= 15 - 10
= 5
x - y = ±√5