N=28.25+-1.18x+0.013x2

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Solution for N=28.25+-1.18x+0.013x2 equation: 



=28.25+-1.18N+0.013N^2

We move all terms to the left:

-(28.25+-1.18N+0.013N^2)=0

We use the square of the difference formula

-(28.25-1.18N+0.013N^2)=0

We get rid of parentheses

-0.013N^2+1.18N-28.25=0

a = -0.013; b = 1.18; c = -28.25;
Δ = b2-4ac
Δ = 1.182-4·(-0.013)·(-28.25)
Δ = -0.0766
Delta is less than zero, so there is no solution for the equation

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