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4x^2+6x+9=21
We move all terms to the left:
4x^2+6x+9-(21)=0
We add all the numbers together, and all the variables
4x^2+6x-12=0
a = 4; b = 6; c = -12;
Δ = b2-4ac
Δ = 62-4·4·(-12)
Δ = 228
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{228}=\sqrt{4*57}=\sqrt{4}*\sqrt{57}=2\sqrt{57}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-2\sqrt{57}}{2*4}=\frac{-6-2\sqrt{57}}{8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+2\sqrt{57}}{2*4}=\frac{-6+2\sqrt{57}}{8} $
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