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Polynomial

fx is a linea...

Question

f(x) is a linear function. If f(1) = 2 and f(3) = 8, then f(x) = ?

3x+1

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2x-1

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None

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3x-1

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Solution

The correct option is D 3x-1

Let f(x)=3x-1.

Then f(1)=3(1)-1=3-1=2 and f(3)=3(3)-1=9-1=8.

Therefore, f(x)=3x-1.

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