f(3.86)=5*3.86^2-3*3.86

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Solution for f(3.86)=5*3.86^2-3*3.86 equation: 



f(3.86)=5*3.86^2-3*3.86

We move all terms to the left:

f(3.86)-(5*3.86^2-3*3.86)=0

We add all the numbers together, and all the variables

f(3.86)-62.918=0

We multiply parentheses

3.86f-62.918=0

We move all terms containing f to the left, all other terms to the right

3.86f=62.918

f=62.918/3.86

f=16+1/3.33333333333

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