Question

Diketahui rumus fungsi f(x) = b – 8x . Jika f(b) = -42, nilai b =..........

Answer 1

F(x) = b - 8x
f(b) = - 42
- 42 = b - 8b
- 42 = - 7b
   b = 6

Answer 2

F(x) = b - 8x = 0
f(x) = b - x = -42

b - 8x = 0 | 1 | b - 8x = 0
b - x = -42 | 1 | b - x = -42 _
-7x = 42
x = -6
f(x) = b - 8x
f(-6) = b - 8(-6)
= b + 48
-b = 48
b = -48
jadi, b = -48

semoga membantu☺