Question 237767
{{{49s^2+28s=-4}}}
{{{49s^2+28s+4 = 0}}}
{{{(7s+2)(7s+2) = 0}}}
{{{7s+2 = 0}}} 
{{{s = -2/7}}}  Since there are two terms, there are two solutions. But both of them are -2/7

See this URL for a plot
http://www.wolframalpha.com/input/?i=49x^2%2B28x%2B4+%3D+0