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-2(w-9)(-w+3)=0
We add all the numbers together, and all the variables
-2(w-9)(-1w+3)=0
We multiply parentheses ..
-2(-1w^2+3w+9w-27)=0
We multiply parentheses
2w^2-6w-18w+54=0
We add all the numbers together, and all the variables
2w^2-24w+54=0
a = 2; b = -24; c = +54;
Δ = b2-4ac
Δ = -242-4·2·54
Δ = 144
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{144}=12$$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-24)-12}{2*2}=\frac{12}{4} =3 $$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-24)+12}{2*2}=\frac{36}{4} =9 $
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