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6x^2+4x+8x=7
We move all terms to the left:
6x^2+4x+8x-(7)=0
We add all the numbers together, and all the variables
6x^2+12x-7=0
a = 6; b = 12; c = -7;
Δ = b2-4ac
Δ = 122-4·6·(-7)
Δ = 312
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{312}=\sqrt{4*78}=\sqrt{4}*\sqrt{78}=2\sqrt{78}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(12)-2\sqrt{78}}{2*6}=\frac{-12-2\sqrt{78}}{12} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(12)+2\sqrt{78}}{2*6}=\frac{-12+2\sqrt{78}}{12} $
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