Question 47573
f(x) = x^2 - 4x - 21
V(-b/2a,f(x))
V(2,-25)
x-intercepts:
0 = x^2 - 4x - 21
0 = (x - 7)(x + 3)
x - 7 = 0
x = 7
(7,0)
and
x + 3 = 0
x = -3
(-3,0)
{{{graph(600,600,-10,10,-25,4,x^2-4x-21)}}}