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(x+7)(x+7)-11=0
We multiply parentheses ..
(+x^2+7x+7x+49)-11=0
We get rid of parentheses
x^2+7x+7x+49-11=0
We add all the numbers together, and all the variables
x^2+14x+38=0
a = 1; b = 14; c = +38;
Δ = b2-4ac
Δ = 142-4·1·38
Δ = 44
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{44}=\sqrt{4*11}=\sqrt{4}*\sqrt{11}=2\sqrt{11}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(14)-2\sqrt{11}}{2*1}=\frac{-14-2\sqrt{11}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(14)+2\sqrt{11}}{2*1}=\frac{-14+2\sqrt{11}}{2} $
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