7x=90+x^2

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Solution for 7x=90+x^2 equation: 



7x=90+x^2

We move all terms to the left:

7x-(90+x^2)=0

We get rid of parentheses

-x^2+7x-90=0

We add all the numbers together, and all the variables

-1x^2+7x-90=0

a = -1; b = 7; c = -90;
Δ = b2-4ac
Δ = 72-4·(-1)·(-90)
Δ = -311
Delta is less than zero, so there is no solution for the equation

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