x2+21=2x+7

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Solution for x2+21=2x+7 equation: 



x2+21=2x+7

We move all terms to the left:

x2+21-(2x+7)=0

We add all the numbers together, and all the variables

x^2-(2x+7)+21=0

We get rid of parentheses

x^2-2x-7+21=0

We add all the numbers together, and all the variables

x^2-2x+14=0

a = 1; b = -2; c = +14;
Δ = b2-4ac
Δ = -22-4·1·14
Δ = -52
Delta is less than zero, so there is no solution for the equation

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