Arun
Last Activity: 7 Years ago
Dear student
Let f(x) = ax2 + bx + c
Given, f(3) = 9
This gives 9a + 3b + c = 9 ... (1)
This gives 9a - 3b + c = -10 ... (2)
Subtracting (2) from (1), we get,
6b = 19
b = 19/6
Thus, the coefficient of x in f(x) is b = 19/6.
Regards
Arun (askIITians forum expert)