1)x^2 - 9 x +14 =0
2) 2x^2 -3 x - 2 = 0
3) 4x^2 + 4x + 1 = 0
4)-7x^2 = 2 - 5x
2) 2x^2 -3 x - 2 = 0
3) 4x^2 + 4x + 1 = 0
4)-7x^2 = 2 - 5x
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По теореме:
Тогда
2)
3)
4)
Тк D<0, то корней нет