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x^2+6x+9=196
We move all terms to the left:
x^2+6x+9-(196)=0
We add all the numbers together, and all the variables
x^2+6x-187=0
a = 1; b = 6; c = -187;
Δ = b2-4ac
Δ = 62-4·1·(-187)
Δ = 784
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{784}=28$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-28}{2*1}=\frac{-34}{2} =-17 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+28}{2*1}=\frac{22}{2} =11 $
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