Algebra stuff.

1
I know this isn't the place to be asking about algebra but ill ask anyway.
Find the value of m so that only one value of x satisfies the equation:
4x^2 – 8x + m = 0
how i do dis?
:?

all ive done is divide the whole equation by 4 to get
x^2 - 4x + m/4 = 0