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2x(2+3x)=26x+868
We move all terms to the left:
2x(2+3x)-(26x+868)=0
We add all the numbers together, and all the variables
2x(3x+2)-(26x+868)=0
We multiply parentheses
6x^2+4x-(26x+868)=0
We get rid of parentheses
6x^2+4x-26x-868=0
We add all the numbers together, and all the variables
6x^2-22x-868=0
a = 6; b = -22; c = -868;
Δ = b2-4ac
Δ = -222-4·6·(-868)
Δ = 21316
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{21316}=146$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-22)-146}{2*6}=\frac{-124}{12} =-10+1/3 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-22)+146}{2*6}=\frac{168}{12} =14 $
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