Question

D. 4 . Fungsi f(x) = px + q, jika f (-1) = -5 dan f (4) = 5, maka nilai f(-2) adalah ... A -10 B. -7 C. 7 D. 10 ​

Answer 1

B. -7

Penjelasan dengan langkah-langkah:

f(x) = px + q

mencari nilai p dan q

f(-1) = -p + q = -5

f(4) = 4p + q = 5

------------------ -

-5p = -10

p = -10/(-5)

= 2

4p + q = 5

4.2 + q = 5

8 + q = 5

q = 5 - 8

= -3

f(x) = 2x - 3

f(-2) = 2.(-2) - 3

= -4 - 3

= -7