X² + px + q = 0
x1 = - 4
x2 = 3
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( - 4 )² - 4p + q = 0
3² + 3p + q = 0
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16 - 4p + q = 0
9 + 3p + q = 0
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- 9 - 3p - q = 0
7 - 7p = 0
7p = 7
p = 1
9 + 3 + q = 0
q = - 12
Уравнение x² + x - 12 = 0