f(2)=8-5(2)

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Solution for f(2)=8-5(2) equation: 



f(2)=8-5(2)

We move all terms to the left:

f(2)-(8-5(2))=0

We add all the numbers together, and all the variables

f2-(-44)=0

We add all the numbers together, and all the variables

f^2+44=0

a = 1; b = 0; c = +44;
Δ = b2-4ac
Δ = 02-4·1·44
Δ = -176
Delta is less than zero, so there is no solution for the equation

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