ПОЖАЛУЙСТА ПОМОГИТЕ С РЕШЕНИЕМ)

Не решая уравнения, определите знаки его корней:

1) x^{2}+7х-1=0

2)x^{2}-7х+1=0

3)5x^{2}+17х+16=0

4)x^{2}-18х+17=0

5)x^{2}-2х-1=0

6)x^{2}-15х+56=0

7)19x^{2}-23х+5=0

8)2x^{2}+5х+6=0

9)11x^{2}-9х-0.02=0

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