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X(72+9X)=0
We add all the numbers together, and all the variables
X(9X+72)=0
We multiply parentheses
9X^2+72X=0
a = 9; b = 72; c = 0;
Δ = b2-4ac
Δ = 722-4·9·0
Δ = 5184
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}$$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{5184}=72$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(72)-72}{2*9}=\frac{-144}{18} =-8 $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(72)+72}{2*9}=\frac{0}{18} =0 $
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