21=6^2+x^2

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Solution for 21=6^2+x^2 equation: 



21=6^2+x^2

We move all terms to the left:

21-(6^2+x^2)=0

We get rid of parentheses

-x^2+21-6^2=0

We add all the numbers together, and all the variables

-1x^2-15=0

a = -1; b = 0; c = -15;
Δ = b2-4ac
Δ = 02-4·(-1)·(-15)
Δ = -60
Delta is less than zero, so there is no solution for the equation

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