Question 242446
You have the correct equation.

To solve you could use the quadratic formula or completing the square. I tend to use the latter as I find it less fiddly but that is just me!

{{{(x+(5/2))^2 - 25/4 = 22}}}

{{{(x+(5/2))^2 = 22+25/4}}}

{{{x = sqrt(113/4)-5/2}}}

x = 2.8m (rounding to the nearest tenth) This is the width and I am sure you can find the length!