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x^2+6x+25=169
We move all terms to the left:
x^2+6x+25-(169)=0
We add all the numbers together, and all the variables
x^2+6x-144=0
a = 1; b = 6; c = -144;
Δ = b2-4ac
Δ = 62-4·1·(-144)
Δ = 612
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{612}=\sqrt{36*17}=\sqrt{36}*\sqrt{17}=6\sqrt{17}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-6\sqrt{17}}{2*1}=\frac{-6-6\sqrt{17}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+6\sqrt{17}}{2*1}=\frac{-6+6\sqrt{17}}{2} $
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