Posted by ppppp on Tuesday, September 4, 2012 at 4:24pm.
the generic equations of parabola is:
y=ax^2+bx+c
by information of the vertex 2;13 i have two facts:
i) 13=a*2^2+b*2+c ....replacing(2;13)
ii)the director of the vertex as equation:
x=-b/2a
by information "intercept at 0,5 ":
iii)5=a*0^2+b*0+c ....replacing(0;5)
tre equation tre unknowns a,b,c
you solve the system
i forgot to specify in ii) x=-b/(2a) => 2=-b/(2a)
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