18у - 21 = 3у² - 42
3у² - 18у - 21 = 0
у² - 6у - 7 = 0
D = 36+ 28 = 64
у₁ = (6 + 8)/2 = 7
у₂ = (6 - 8)/2 = -1
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18у - 21 = 3у² - 42
3у² - 18у - 21 = 0
у² - 6у - 7 = 0
D = 36+ 28 = 64
у₁ = (6 + 8)/2 = 7
у₂ = (6 - 8)/2 = -1