So I wrote a test last Friday and the question was to complete the square which I know how to do but they gave me this crazy equation

5x^{2 }= -x

5x^{2}+ x = 0

(x^{2}+ x + x/5/2) - x/5/2 = 0

(x^{2}+ x/5 + x/5/2) = x/5/2

this is where I got stuck