jika nilai (x-y)=8 dan xy = 12, nilai x kuadrat + y kuadrat

x - y = 8
xy = 12
x² + y² = ___?

x - y = 8
(x - y)² = 8²
x² - 2 xy + y² = 64
x² - 2×12 + y² = 64
x² + y² = 64 + 24
x² + y² = 88 ✓