Question 356876
I think by graphing it the differences become much more apparent.
.
.
.
{{{drawing(300,300,-10,10,-10,10,grid(1),circle(0,0,0.3),circle(-7,0,0.3),circle(4,0,0.3),graph(300,300,-10,10,-10,10,x^2,(x-4)^2,(x+7)^2))}}}
.
.
.

The first graph (red) is {{{y=x^2}}}
The second graph (green) is {{{y=(x-4)^2}}}
The third graph (blue) is {{{y=(x+7)^2}}}