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(2x-1)(x+3)-(x+6)(2-x)-(-9x-42)=0
We add all the numbers together, and all the variables
(2x-1)(x+3)-(x+6)(-1x+2)-(-9x-42)=0
We get rid of parentheses
(2x-1)(x+3)-(x+6)(-1x+2)+9x+42=0
We multiply parentheses ..
(+2x^2+6x-1x-3)-(x+6)(-1x+2)+9x+42=0
We add all the numbers together, and all the variables
(+2x^2+6x-1x-3)+9x-(x+6)(-1x+2)+42=0
We get rid of parentheses
2x^2+6x-1x+9x-(x+6)(-1x+2)-3+42=0
We multiply parentheses ..
2x^2-(-1x^2+2x-6x+12)+6x-1x+9x-3+42=0
We add all the numbers together, and all the variables
2x^2-(-1x^2+2x-6x+12)+14x+39=0
We get rid of parentheses
2x^2+1x^2-2x+6x+14x-12+39=0
We add all the numbers together, and all the variables
3x^2+18x+27=0
a = 3; b = 18; c = +27;
Δ = b2-4ac
Δ = 182-4·3·27
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{-18}{6}=-3$
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