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If there is any equation of the format ax^2+bx+c=0 then you can use the formula 

x=(-b + √ b^2-4ac)/2a or (-b -√ b^2-4ac)/2a to find the roots of the quadratic equation.
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There many ways to solve a quadratic equation.
1. Try to find factors of Left hand side and equate each to zero, to get the solution. Splitting of terms is commonly used for this method.
 x^{2} +4x+4=04x
must be splitted in such a way the product of the splitted terms is equal to the product of the coefficient of  x^{2} and constant term.
Therefore,  x^{2} +(2x+2x)+4=0
On equating the factors to zero we get,
2. You can use quadatric formula.
For equation of form,
x= \frac{-b \frac{+}{-} \sqrt{b^{2}-4ac } }{2a}
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