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3(x)=3x^2+2x-7
We move all terms to the left:
3(x)-(3x^2+2x-7)=0
We get rid of parentheses
-3x^2+3x-2x+7=0
We add all the numbers together, and all the variables
-3x^2+x+7=0
a = -3; b = 1; c = +7;
Δ = b2-4ac
Δ = 12-4·(-3)·7
Δ = 85
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-\sqrt{85}}{2*-3}=\frac{-1-\sqrt{85}}{-6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{85}}{2*-3}=\frac{-1+\sqrt{85}}{-6} $
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