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(x+5)(x+5)=199
We move all terms to the left:
(x+5)(x+5)-(199)=0
We multiply parentheses ..
(+x^2+5x+5x+25)-199=0
We get rid of parentheses
x^2+5x+5x+25-199=0
We add all the numbers together, and all the variables
x^2+10x-174=0
a = 1; b = 10; c = -174;
Δ = b2-4ac
Δ = 102-4·1·(-174)
Δ = 796
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{796}=\sqrt{4*199}=\sqrt{4}*\sqrt{199}=2\sqrt{199}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-2\sqrt{199}}{2*1}=\frac{-10-2\sqrt{199}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+2\sqrt{199}}{2*1}=\frac{-10+2\sqrt{199}}{2} $
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