F(x)=-x2+15x-56

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Solution for F(x)=-x2+15x-56 equation: 



(F)=-F2+15F-56

We move all terms to the left:

(F)-(-F2+15F-56)=0

We add all the numbers together, and all the variables

-(-1F^2+15F-56)+F=0

We get rid of parentheses

1F^2-15F+F+56=0

We add all the numbers together, and all the variables

F^2-14F+56=0

a = 1; b = -14; c = +56;
Δ = b2-4ac
Δ = -142-4·1·56
Δ = -28
Delta is less than zero, so there is no solution for the equation

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