Question

Sebuah fungsi f(x) :
2x(pangkat 2) + 3 ; jika x < 1
2x - 1 ; jika x > atau = 1
Nilai f(1)+ f(-2)=....
A.12
B.8
C.0
D.-5

Answer 1

F(1) {x> atau =1} jadi pake 2x-1
f(-2) {x<1} jadi pake 2x^+3

ya sudah, tinggal dimasukin

f(1) = (2.1)-1 = 1
f(-2) = 2.(-2)^+3 = 11

Jadi, f(1)+f(-2) = 1+11 = 12 [A]

Answer 2

F(1)  = 2(1) - 1 = 2 - 1 = 1
f(-2) = 2(-2)^2 + 3 = 2(4) + 3 = 11

jadi nila f(1) + f(-2) = 1 + 11 = 12