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3x^2-2x=-4x-7x^2+12
We move all terms to the left:
3x^2-2x-(-4x-7x^2+12)=0
We get rid of parentheses
3x^2+7x^2+4x-2x-12=0
We add all the numbers together, and all the variables
10x^2+2x-12=0
a = 10; b = 2; c = -12;
Δ = b2-4ac
Δ = 22-4·10·(-12)
Δ = 484
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{484}=22$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-22}{2*10}=\frac{-24}{20} =-1+1/5 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+22}{2*10}=\frac{20}{20} =1 $
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