Respuesta :

Nirina7
the main equation is y=a(x-h)²+k
the focus is (h, k+p), where p=1/4a
y=k-p
(h, k+p)=(−5, −5) , 
the derivative
y'=2a(x-h)
y'=-2/20(x+5)=(-1/10)(x+5)

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good job