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x ∈ { - 4 , - 3 , - 1/2 , 1/2 , 3 , 4 }
a) f(x) = 3^x
f(- 4) = 3⁻⁴ = (1/3)⁴ = 1/81
f(- 3) = 3⁻³ = (1/3)³ = 1/27)
f(- 1/2) = 3 ⁻¹/² = (1/3)¹/² = 1/√3 = √3/3
f(1/2) = 3¹/² = √3
f(3) = 3³ = 27
f(4) = 3⁴ = 81
b)
f(x) = 4^x
f(- 4) = 4⁻⁴ = (1/4)⁴ = 1/256
f(- 3) = 4⁻³ = (1/4)³ = 1/64
f(- 1/2) =4 ⁻¹/² = (1/4)¹/² = 1/√4 = 1/2
f(1/2) = 4¹/² = √4 = 2
f(3) = 4³ = 64
f(4) = 4⁴ = 256
c)
f(x) = (1/4)^x
f(- 4) = (1/4)⁻⁴ = 4⁴ = 256
f(- 3) = (1/4)⁻³ = 4³ = 64
f(- 1/2) = (1/4)⁻¹/² = 4¹/² = √4 = 2
f(1/2) = (1/4)¹/² = √(1/4) = 1/√4 = 1/2
f(3) = (1/4)³ = 1/64
f(4) = (1/4)⁴ = 1/256
d)
f(x) = (1/2)^x
f(- 4) = (1/2)⁻⁴ = 2⁴ = 16
f( - 3) = (1/2)⁻³ = 2³ = 8
f(- 1/2) = (1/2)⁻¹/² = 2¹/² = √2
f(1/2) = (1/2)¹/² = 1/√2 = √2/2
f(3) = (1/2)³ = 1/8
f(4) = (1/2)⁴ = 1/16
zad 2
P = (2,16)
f(x) = a^x
16 = a²
16 = 4²
a = 4
a) Q = (1/2 , 2)
2 = 4¹/2
2 = √4
2 = 2 punkt należy do wykresu funkcji
b)
Q = (5 , 1024)
1024 = 4⁵
1024 = 1024 punkt należy do wykresu funkcji
c)
Q = (- 3 , 1/16)
1/16 = 4⁻³
1/16 = (1/4)³
1/16 ≠ 1/64 punkt nie należy do wykresu funkcji
d)
Q = (- 1/4) , √2/2)
√2/2 = 4⁻¹/⁴
√2/2 = 4¹/⁴
2⁻¹/² ≠ 2¹/² punkt nie należy do wykresu funkcji
zad 3
P = (2,2) f(x) = a^x
2 = a²
a = √2
a)
Q = (1 , 1)
1 ≠ (√2)¹ punkt nie należy do wykresu funkcji
b)
Q = (4 , 4)
4 = (√2)⁴ punkt należy do wykresu funkcji
c)
Q = (8 , 8)
8 = (√2)⁸
8 ≠ 2⁴ punkt nie należy do wykresu funkcji
d)
Q = (- 8 , 1/16)
1/16 = (√2)⁻⁸
1/16 = (1/√2)⁸
1/16 = (1/2)⁴ punkt należy do wykresu funkcji
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