x2=4x-21=0

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Solution for x2=4x-21=0 equation: 



x2=4x-21=0

We move all terms to the left:

x2-(4x-21)=0

We add all the numbers together, and all the variables

x^2-(4x-21)=0

We get rid of parentheses

x^2-4x+21=0

a = 1; b = -4; c = +21;
Δ = b2-4ac
Δ = -42-4·1·21
Δ = -68
Delta is less than zero, so there is no solution for the equation

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