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3(x-3)(4x-4)=0
We multiply parentheses ..
3(+4x^2-4x-12x+12)=0
We multiply parentheses
12x^2-12x-36x+36=0
We add all the numbers together, and all the variables
12x^2-48x+36=0
a = 12; b = -48; c = +36;
Δ = b2-4ac
Δ = -482-4·12·36
Δ = 576
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{576}=24$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-48)-24}{2*12}=\frac{24}{24} =1 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-48)+24}{2*12}=\frac{72}{24} =3 $
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