Question 196664
{{{AreaOfRectangle = Lenght*Width}}}
{{{55 = x * (x+6)}}}
{{{55 = x^2 + 6x}}}
{{{0 = x^2 + 6x - 55}}}
{{{0 = (x+11)(x-5)}}}
x = -11 or 5
Since a side cannot be negative, x = 5
Then x+6 = 11