-x2+x=-2x+21

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



-x2+x=-2x+21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1x^2+x-(-2x+21)=0

We get rid of parentheses

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

We add all the numbers together, and all the variables

-1x^2+3x-21=0

a = -1; b = 3; c = -21;
Δ = b2-4ac
Δ = 32-4·(-1)·(-21)
Δ = -75
Delta is less than zero, so there is no solution for the equation

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