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6x(x+1)+5=13-2+7x
We move all terms to the left:
6x(x+1)+5-(13-2+7x)=0
We add all the numbers together, and all the variables
6x(x+1)-(7x+11)+5=0
We multiply parentheses
6x^2+6x-(7x+11)+5=0
We get rid of parentheses
6x^2+6x-7x-11+5=0
We add all the numbers together, and all the variables
6x^2-1x-6=0
a = 6; b = -1; c = -6;
Δ = b2-4ac
Δ = -12-4·6·(-6)
Δ = 145
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1)-\sqrt{145}}{2*6}=\frac{1-\sqrt{145}}{12} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{145}}{2*6}=\frac{1+\sqrt{145}}{12} $
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