Question

Diketahui fungsi f dirumuskan dengan f(x) = -3x + 6

a. tentukan bayangan dari -3 dan 2
b. jika f(a) = -9, tentukan nilai a

jawab plis

Answer 1

F(-3) = -3(-3) + 6
= 9 + 6
= 15
f(2) = -3(2) + 6
= -6 + 6
= 0

-3a + 6 = 9
-3a = 9 - 6
-3a = 3
a = -1

Answer 2

F( x ) = -3x + 6 f(-3 ) = -3(-3) + 6 = 9+ 6 = 15 f(2) = -3 ( 2 ) + 6 = -6 + 6 = 0 f(a) = -9 -3a + 6 = -9 -3a = -15 a = -15: -3 = 5