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Odp. D
(x²-6x+9)(x²+3)=0 , x²+3 ≥3 nie ma m.z.
(x²-6x+9)=0
(x-3)²=0
x-3=0
x=3 jedno rozwiazanie
2.
x²(2x-1)+7x+(x-2)²=3x-246
2x³-x²+7x+x²-4x+4-3x=-246
2x³=-246-4
2x³=-250 /:2
x³=-125
x=∛(-125)
x=-5
Odp. D.
(x² - 6 + 9)(x² + 3) = 0
(x² - 6 + 9) = 0
(x - 3)² = 0
x - 3 = 0
x = 3
lub
x² + 3 = 0
x² ≠ - 3
2.
x²(2x - 1) + 7x + (x - 2)² = 3x - 246
2x³ - x² + 7x + x² - 4x + 4 - 3x = -246
2x³ + 4 = -246
2x³ = -246 - 4
2x³ = -250 /:2
x³ = - 125
x = ∛(-125)
x = -5