F(x) = 4+3x-x²
-----------------
F(3) = 4+3(3)-(3)²
F(3) = 4+9-9
F(3) = 4
--------------------
F(3+h) = 4+3(3+h)-(3+h)²
F(3+h) = 4+9+3h-9-6h-h²
F(3+h) = 4-3h-h²
-----------------------------------
y eso es todo , espero se entienda xD
SALUDOS!!
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F(x) = 4+3x-x²
-----------------
F(3) = 4+3(3)-(3)²
F(3) = 4+9-9
F(3) = 4
--------------------
F(3+h) = 4+3(3+h)-(3+h)²
F(3+h) = 4+9+3h-9-6h-h²
F(3+h) = 4-3h-h²
-----------------------------------
y eso es todo , espero se entienda xD
SALUDOS!!