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(3x-2)(x-4)=88
We move all terms to the left:
(3x-2)(x-4)-(88)=0
We multiply parentheses ..
(+3x^2-12x-2x+8)-88=0
We get rid of parentheses
3x^2-12x-2x+8-88=0
We add all the numbers together, and all the variables
3x^2-14x-80=0
a = 3; b = -14; c = -80;
Δ = b2-4ac
Δ = -142-4·3·(-80)
Δ = 1156
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{1156}=34$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-14)-34}{2*3}=\frac{-20}{6} =-3+1/3 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-14)+34}{2*3}=\frac{48}{6} =8 $
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