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x2-3x-3x-11=x-5x+5
We move all terms to the left:
x2-3x-3x-11-(x-5x+5)=0
We add all the numbers together, and all the variables
x2-3x-3x-(-4x+5)-11=0
We add all the numbers together, and all the variables
x^2-6x-(-4x+5)-11=0
We get rid of parentheses
x^2-6x+4x-5-11=0
We add all the numbers together, and all the variables
x^2-2x-16=0
a = 1; b = -2; c = -16;
Δ = b2-4ac
Δ = -22-4·1·(-16)
Δ = 68
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{68}=\sqrt{4*17}=\sqrt{4}*\sqrt{17}=2\sqrt{17}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-2\sqrt{17}}{2*1}=\frac{2-2\sqrt{17}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+2\sqrt{17}}{2*1}=\frac{2+2\sqrt{17}}{2} $
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