Make y the subject of $x=y^2-y$
I put this into Wolfram Alpha and it said the answer was $(1\pm\frac{\sqrt{4x+1}}{2})$ but I have absolutely no idea how it got to that answer, so I'd appreciate if someone could explain it to me, thanks in advance.
How to find $\lim_{h\rightarrow 0}\frac{\sin(ha)}{h}$ without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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