Hi - I guess this is easy but I am having trouble solving it. I am supposed to find the inverse of the quadratic function
y = x^2 - 2x +1
Thanks in advance for any help, I am not sure if I can just factor it? The answer is supposed to be y = 1 +- srqrt X
Thanks sorry I didn't get it at first.
Do you know of a place that explains why the x ends up as + or - sqrt(x) when you take the square root. I understand that is the answer but I don't really get why. Sorry again.
this is so because whwn u mutiply a neg. no. by itself(-a*-a) the result will come positive.
and if u multiply a positive no. with itself(a*a) the result will be positive.
so it cant be made out if the sqrt was originally posit. or neg.. so to be on the safer side we take both +&-.
You get the "plus-minus" from the Quadratic Formula or, if you prefer, from completing the square. (But that's the hard way!)