Question 622083
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
x	f(x)
-2	-7
0	3
4	-73
 f(x) = ax^2 + bx  + c
 f(0) = ax^2 + bx  + c = 3, c = 3
 f(-2) = 4a + -2b + 3 = -7
 f(4)  =16a + 4b + 3 = -73
 4a  -2b = -10   ||multiplying by 2 and adding to the 2nd EQ to eliminate b
16a + 4b = -76 
      24a = -96
        a = -4   and b = -3   (-16 -2b = -10, -2b = 6, b = -3)
f(x) = -4x^2 - 3x + 3