Question

Diketahui df(x)/dx =3.jika f(4)=19, maka f(1) =.......????

Answer 1

F(x) = int 3√x dx
= 3/(3/2) x^(3/2) + c
= 2x√x + c
f(4) = 19 ⇒ 19 = 2(4)√4 + c
c = 19 - 16 = 3
maka f(x) = 2x√x + 3
f(1) = 2 + 3 = 5