Question 364090
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Hi
*Note: stand form for the equation of a parabola:
y = ax^2 + bx + c  
Pt(0,4)tells us c = -4
y = ax^2 + bx - 4  
(2,8) and -2,0)
8 = 4a + 2b - 4 
0 = 4a - 2b - 4 
8 = 8a - 8
16 = 8a
a = 2
b = 2   (8 = 8 + 2b - 4 )
Y= 2x^2 + 2x - 4

{{{graph( 300, 300,-15,15,-15,15, 2x^2+2x-4) }}}