Hi. First of all - sincere apologies if this is in the wrong place. I have read the rules, but unfortunately don't really know all categories of mathematics, or what comes under which umbrella.

Anyway, simple quadratic equations I don't find difficult.

However, this problem is seriously getting to me. The exercise book I have bought claims the answer to be 0.2, but I simply cannot find out why. I thought QE were meant to have ± values, and this is just making me crazy.

(x-1)^2 = x(x-3)

I have expanded the brackets to find:

X^2-2x+1 = X^2-3x

But I have honestly no clue where to go from next. I have tried researching it, or finding other similar problems online but to no avail.

Thanks in advance.