-x^2-7x=21

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Solution for -x^2-7x=21 equation: 



-x^2-7x=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1x^2-7x-21=0

a = -1; b = -7; c = -21;
Δ = b2-4ac
Δ = -72-4·(-1)·(-21)
Δ = -35
Delta is less than zero, so there is no solution for the equation

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