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y² = 16x² --> 1) y = 4x lub 2) y = -4x
1) x4 = 4x
x4 - 4x = 0
x(x3 - 4) = 0
x3 = 4 -> x6 = 16
2) x4 = -4x
x4 + 4x = 0
x(x3 + 4) = 0
x3 = -4 -> x6 = 16
Zatem odp. C