Posted by rock on Wednesday, July 20, 2011 at 9:54am.
let f(x) = ax^2 + bx + c
given f(1) = 10
10 = a + b + c (#1)
given f(-2) = 1
1 = 4a - 2b + c (#2)
given f(-1) = 0 , .... (it said x+1 is a factor)
0 = a - b + c (#3)
#1 - #3
10 = 0 + 2b + 0
b = 5
#2 - #3
1 = 3a - b + 0 , but b=5
6 = 3a
a = 2
in #1
2 + 5 + c = 10
c = 3
a=2, b=5, c=3
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