Question

Diketahui f(x) mempunyai nilai minimum -1 pada x=1 dan f'(x) =x+a, tentukan f(x)

Answer 1

F ' (1) = 1 + a
- 1 = 1 + a
a = - 2

f '(x) = x - 2
f(x) = int (x - 2) dx
     = (1/2)x² - 2x + c

Answer 2

F ' (x) = -1
f '(x) = x + a
x = 1
f ' (1) = 1 + a
-1 = 1 + a
a = -1-1
a= -2

f '(x) = x - 2
f (x) = integral x - 2 dx
= 1/2 x^2 - 2x + c