[tex]\it f(x) = 2^{x+1} - 1
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I)\ \ Gf\cap Oy = A(0,\ y)
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A(0,\ y) \in Gf \Rightarrow f(0)=y \Rightarrow 2^{0+1} -1=y \Rightarrow 2-1=y \Rightarrow
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\Rightarrow y=1 \Rightarrow Gf\cap Oy = A(0,\ 1)
\\ \\ \\
II)\ \ Gf\cap Ox = B(x,\ 0)
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B(x,\ 0) \in Gf \Rightarrow f(x)=0 \Rightarrow 2^{x+1} -1=0 \Rightarrow 2^{x+1} = 1 \Rightarrow [/tex]
[tex]\it \Rightarrow 2^{x+1} = 2^0 \Rightarrow x+1=0 \Rightarrow x=-1 \Rightarrow Gf\cap Ox=B(-1,\ 0)[/tex]
