f(2.5)=2.5^2-2.5-6

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Solution for f(2.5)=2.5^2-2.5-6 equation: 



f(2.5)=2.5^2-2.5-6

We move all terms to the left:

f(2.5)-(2.5^2-2.5-6)=0

We add all the numbers together, and all the variables

f(2.5)+2.25=0

We multiply parentheses

2.5f+2.25=0

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

2.5f=-2.25

f=-2.25/2.5

f=-1/1.11111111111

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