Помогите плиз)))

1) x^2-3x-4=2x-10 (Решить)

2)Найти нули квадратичной функции:

y= 7x^2+ 3x ;  49x^2 + 42x +9

y=15x^2+7x -2 ;

 

y= -20x^2+ 3x +2;  

y= 49x^2 + 42x +9 

 

 

 

 

 

 

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