Solve |x-3|^2 - 4|x-3|=12
The solution to this equation is -3, 9. But I'm not sure on the working.
There is a hint to let u=|x-3|
So I worked it out the following way.
u^2 -4u = 12
u^2 -4u -12 = 0
(u + 2)(u - 6)=0
u /= -2 and u /= 6
|x-3|=-2 (no solution)
|x-3|= 6, x = 9
Now to work...
I know this thread is over 8 years old, but this reply is for the benefit of someone like me who stumbles across it. Plus I think I can explain it in a more simpler manner, especially for those with basic stats knowledge.
Ok, say you did the first 10,000 coin flips, and got 9000 heads...