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DOMINIO:
y = -x²
Domf = R
RECORRIDO:
y = -x²
"x" es real ⇔ -√y ≥ 0
-√y ≥ 0
(-1) -√y ≥ 0 (-1)
√y ≤ 0
y ≤ 0
Recf: ]-inf ; 0]
PARES ORDENADOS:
F(x) = {...(-5;1) , (-7;0) , (-2;1/2) , (-9;2) , (-10;-2)...}