ROZWIĄŻ:
1) 4x(do kwardatu) - 9 = 0
2) 81x(do kwadratu) = 25
3) 9x (do kwadratu) + 1 = 0
4) -4x (do kwadratu) + 1 = 0
5) x (do kwadratu) + 7 = 0
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4x² - 9 = 0
4x² = 9
x² = 9/4
x = 3/2 lub x = -3/2
81x² = 25
x² = 25/81
x = 5/9 lub x = -5/9
9x² + 1 = 0
9x² = -1
sprezczność
-4x² + 1 = 0
-4x² = -1
4x² = 1
x² = 1/4
x² = 1/2 lub x = -1/2
x² + 7 = 0
x² = -7
sprzeczność
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