(3-x)(6+x)=21

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Solution for (3-x)(6+x)=21 equation: 



(3-x)(6+x)=21

We move all terms to the left:

(3-x)(6+x)-(21)=0

We add all the numbers together, and all the variables

(-1x+3)(x+6)-21=0

We multiply parentheses ..

(-1x^2-6x+3x+18)-21=0

We get rid of parentheses

-1x^2-6x+3x+18-21=0

We add all the numbers together, and all the variables

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

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

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