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A) ![121- x^{2} =0 121- x^{2} =0](https://tex.z-dn.net/?f=121-+x%5E%7B2%7D+%3D0)
![- x^{2} =-121 - x^{2} =-121](https://tex.z-dn.net/?f=-+x%5E%7B2%7D+%3D-121)
![x^{2} =121 x^{2} =121](https://tex.z-dn.net/?f=+x%5E%7B2%7D+%3D121)
![x=+-11 x=+-11](https://tex.z-dn.net/?f=x%3D%2B-11)
![x_{1} =11 x_{1} =11](https://tex.z-dn.net/?f=+x_%7B1%7D+%3D11)
![x_{2} =-11 x_{2} =-11](https://tex.z-dn.net/?f=+x_%7B2%7D+%3D-11)
Ответ : -11;11.
Б)![5x^{2}-22x-15=0 5x^{2}-22x-15=0](https://tex.z-dn.net/?f=+5x%5E%7B2%7D-22x-15%3D0)
![D=(-22)^{2} -5*4*(-15)=484+300= sqrt{784} =28
D=(-22)^{2} -5*4*(-15)=484+300= sqrt{784} =28](https://tex.z-dn.net/?f=D%3D%28-22%29%5E%7B2%7D+-5%2A4%2A%28-15%29%3D484%2B300%3D+sqrt%7B784%7D+%3D28%0A)
![x_{1} = frac{22-28}{10} = - frac{3}{5} x_{1} = frac{22-28}{10} = - frac{3}{5}](https://tex.z-dn.net/?f=++x_%7B1%7D+%3D+frac%7B22-28%7D%7B10%7D++%3D+-+frac%7B3%7D%7B5%7D+)
![x_{2} = frac{22+28}{10} =5 x_{2} = frac{22+28}{10} =5](https://tex.z-dn.net/?f=+x_%7B2%7D+%3D+frac%7B22%2B28%7D%7B10%7D+%3D5)
Ответ:
; 5
Ответ : -11;11.
Б)
Ответ:
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