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3x² -(x² -11) = 58
2x² +11= 58
2x² = 47
x² = 47/2
x = 1/2 √94 atau x = -12 √94
y² = x² -11 -->
y² = 47/2 - 11 = 25/2
y = 5/2 √2 atau y = -5/2√2