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F (x) = x² + x - 1 F (X + 2)
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F (x) = x² + x - 1 F (X + 2)

User Forrest Keppler
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\begin{gathered} f(x)=x^2+x-1 \\ To\text{ find f(x+1) , we substitute x+1 for x,} \\ f(x+1)=(x+1)^2+x+1-1 \\ =x^2+2x+1+x+1-1 \\ f(x+1)=x^2+3x+1 \end{gathered}

User Rishabh Agrawal
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