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(2x+8)(6x+4)=0
We multiply parentheses ..
(+12x^2+8x+48x+32)=0
We get rid of parentheses
12x^2+8x+48x+32=0
We add all the numbers together, and all the variables
12x^2+56x+32=0
a = 12; b = 56; c = +32;
Δ = b2-4ac
Δ = 562-4·12·32
Δ = 1600
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{1600}=40$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(56)-40}{2*12}=\frac{-96}{24} =-4 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(56)+40}{2*12}=\frac{-16}{24} =-2/3 $
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