dada a funcao (f)x=2x²-1 calcule:
a) f(-3)
b) f(-1/4)
dada a função f(x)= x+1/x calcule:
a) f(-1)
b) f(1/5)
c f(-4)
Soluções para a tarefa
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F(x) = 2x^2 - 1
a) F(-3)
F(3) = 2 × 3^2 - 1
F(3) = 2 × 9 - 1
F(3) = 18 - 1
F(3) = 17
b) F(-1/4)
F(-1/4) = 2 × (-1/4)^2 - 1
F(-1/4) = 2 × (2/4) - 1
F(-1/4) = 4/4 - 1
F(-1/4) = 1 - 1
F(-1/4) = 0
F(x) = x + 1/x
a)F(-1)
F(-1) = (-1) + 1/(-1)
F(-1) = (-1) - 1
F(-1) = = -2
b) F(1/5)
F(1/5) = (1/5) + 1/(1/5)
F(1/5) = (1/5) + 1 × 5/1
F(1/5) = 1/5 + 5 ( M.M.C. )
F(1/5) = ( 1 + 25 ) / 5
F(1/5) = 26/5
c) F(-4)
F(-4) = (-4) + 1 / (-4)
F(-4) = ( -4 ) - 1/4 ( M.M.C. )
F(-4) = -16 - 1 / 4
F(-4) = -17/4
a) F(-3)
F(3) = 2 × 3^2 - 1
F(3) = 2 × 9 - 1
F(3) = 18 - 1
F(3) = 17
b) F(-1/4)
F(-1/4) = 2 × (-1/4)^2 - 1
F(-1/4) = 2 × (2/4) - 1
F(-1/4) = 4/4 - 1
F(-1/4) = 1 - 1
F(-1/4) = 0
F(x) = x + 1/x
a)F(-1)
F(-1) = (-1) + 1/(-1)
F(-1) = (-1) - 1
F(-1) = = -2
b) F(1/5)
F(1/5) = (1/5) + 1/(1/5)
F(1/5) = (1/5) + 1 × 5/1
F(1/5) = 1/5 + 5 ( M.M.C. )
F(1/5) = ( 1 + 25 ) / 5
F(1/5) = 26/5
c) F(-4)
F(-4) = (-4) + 1 / (-4)
F(-4) = ( -4 ) - 1/4 ( M.M.C. )
F(-4) = -16 - 1 / 4
F(-4) = -17/4
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