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9x(x+10)-3x=18
We move all terms to the left:
9x(x+10)-3x-(18)=0
We add all the numbers together, and all the variables
-3x+9x(x+10)-18=0
We multiply parentheses
9x^2-3x+90x-18=0
We add all the numbers together, and all the variables
9x^2+87x-18=0
a = 9; b = 87; c = -18;
Δ = b2-4ac
Δ = 872-4·9·(-18)
Δ = 8217
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{8217}=\sqrt{9*913}=\sqrt{9}*\sqrt{913}=3\sqrt{913}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(87)-3\sqrt{913}}{2*9}=\frac{-87-3\sqrt{913}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(87)+3\sqrt{913}}{2*9}=\frac{-87+3\sqrt{913}}{18} $
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