-21+8x=x^2

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Solution for -21+8x=x^2 equation: 



-21+8x=x^2

We move all terms to the left:

-21+8x-(x^2)=0

determiningTheFunctionDomain
-x^2+8x-21=0

We add all the numbers together, and all the variables

-1x^2+8x-21=0

a = -1; b = 8; c = -21;
Δ = b2-4ac
Δ = 82-4·(-1)·(-21)
Δ = -20
Delta is less than zero, so there is no solution for the equation

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