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(3x+6)(3x+6)-18=0
We multiply parentheses ..
(+9x^2+18x+18x+36)-18=0
We get rid of parentheses
9x^2+18x+18x+36-18=0
We add all the numbers together, and all the variables
9x^2+36x+18=0
a = 9; b = 36; c = +18;
Δ = b2-4ac
Δ = 362-4·9·18
Δ = 648
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{648}=\sqrt{324*2}=\sqrt{324}*\sqrt{2}=18\sqrt{2}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(36)-18\sqrt{2}}{2*9}=\frac{-36-18\sqrt{2}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(36)+18\sqrt{2}}{2*9}=\frac{-36+18\sqrt{2}}{18} $
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