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11i(9-6i)=0
We add all the numbers together, and all the variables
11i(-6i+9)=0
We multiply parentheses
-66i^2+99i=0
a = -66; b = 99; c = 0;
Δ = b2-4ac
Δ = 992-4·(-66)·0
Δ = 9801
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$i_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$i_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{9801}=99$$i_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(99)-99}{2*-66}=\frac{-198}{-132} =1+1/2 $$i_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(99)+99}{2*-66}=\frac{0}{-132} =0 $
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