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180=3x(6x+10)+x
We move all terms to the left:
180-(3x(6x+10)+x)=0
We calculate terms in parentheses: -(3x(6x+10)+x), so:We get rid of parentheses
3x(6x+10)+x
We add all the numbers together, and all the variables
x+3x(6x+10)
We multiply parentheses
18x^2+x+30x
We add all the numbers together, and all the variables
18x^2+31x
Back to the equation:
-(18x^2+31x)
-18x^2-31x+180=0
a = -18; b = -31; c = +180;
Δ = b2-4ac
Δ = -312-4·(-18)·180
Δ = 13921
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{-(-31)-\sqrt{13921}}{2*-18}=\frac{31-\sqrt{13921}}{-36} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-31)+\sqrt{13921}}{2*-18}=\frac{31+\sqrt{13921}}{-36} $
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