I have a quadratic function:
$f(x) = w_0 + w_1 \cdot x + w_2 \cdot (x^2)$
How would I know which estimated coefficients are zero by look at a graph? For example:
I can clearly see that the line starts on y=0 on the above first and thrid graphs. And that both x and y of the line start at 0 for the second and fourth graphs.
But, how would I know which estimated coefficients are zero for each graph?
Disclaimer: I never took linear algebra. Any explanation or even links would be appreciated! Thanks!