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-2(3x+7)=-3(2x+8)x=-5
We move all terms to the left:
-2(3x+7)-(-3(2x+8)x)=0
We multiply parentheses
-6x-(-3(2x+8)x)-14=0
We calculate terms in parentheses: -(-3(2x+8)x), so:We get rid of parentheses
-3(2x+8)x
We multiply parentheses
-6x^2-24x
Back to the equation:
-(-6x^2-24x)
6x^2+24x-6x-14=0
We add all the numbers together, and all the variables
6x^2+18x-14=0
a = 6; b = 18; c = -14;
Δ = b2-4ac
Δ = 182-4·6·(-14)
Δ = 660
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{660}=\sqrt{4*165}=\sqrt{4}*\sqrt{165}=2\sqrt{165}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(18)-2\sqrt{165}}{2*6}=\frac{-18-2\sqrt{165}}{12} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(18)+2\sqrt{165}}{2*6}=\frac{-18+2\sqrt{165}}{12} $
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