Respuesta :

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x = a - 2by^2

- a

x - a = -2by^2

/-2b

(x - a)/-2b = y^2

square root it:

y = √(x - a)/-2b

(note : everything is inside the square root)

Have A Nice Day ❤  

Stay Brainly! ヅ  

- Ally ✧  

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