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4x^2+12=6x+18
We move all terms to the left:
4x^2+12-(6x+18)=0
We get rid of parentheses
4x^2-6x-18+12=0
We add all the numbers together, and all the variables
4x^2-6x-6=0
a = 4; b = -6; c = -6;
Δ = b2-4ac
Δ = -62-4·4·(-6)
Δ = 132
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{132}=\sqrt{4*33}=\sqrt{4}*\sqrt{33}=2\sqrt{33}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-2\sqrt{33}}{2*4}=\frac{6-2\sqrt{33}}{8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+2\sqrt{33}}{2*4}=\frac{6+2\sqrt{33}}{8} $
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