Ficha funciones

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FICHA RECOPILATORIA DE FUNCIONES 3º ESO 1. Haz una tabla de valores y representa las siguientes funciones: a) y = f(x) = 3 – 2x f(-1) = 3 – 2·(-1) = 3 + 2 = 5 f(0) = 3 f(1) = 3 – 2·1 = 3-2 = 1 x y -1

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1

b) y = f(x) = x2 – 2x + 1 (como no va a salir una recta le damos más valores) f(-2) = (-2)2 -2·(-2) + 1 = 4 + 4 + 1 = 9 f(-1) = (-1)2 -2·(-1) + 1 = 1 + 2 + 1 = 4 f(0) = 1 f(1) = 12 – 2·1 + 1 = 1 – 2 + 1 = 0 2 f(2) = 2 – 2·2 + 1 = 4 – 4 + 1 = 1 f(3) = 32 – 2·3 + 1 = 9 – 6 + 1= 4 x y -2

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-1

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