so I have the function f(x)= -3x2 - 18x - 26.
I've put this into TP form and have gotten (x+3)2 - 1/3
This would lead me to believe that the x turning point is -3 and the y turning point is - 1/3. However, when graphing it using desmos, it shows that the y turning point is 1.
I thought I did something wrong, but using that turning point form, I found the correct x intercepts, so I'm very confused! Can anyone help?