1.diketahui rumus fungsi f(x) = - x - 1. nilai f(3) adalah a. 4 b. 2 c. -2 d. -4 2. diketahui f(x) = px + q. jika f (3) = -10 dan f(-2) = 0, maka f(-7) adalah a

1. f(3) = -(3) -1 = -3-1 = -4 Jwb. d

2.
f(3) = 10
f(-2) = 0
_________ __
(3-(-2))f(x) = (10-0)X + (3×0 - 10×(-2))
(3+2)f(x) = 10X + (0 -(-20))
5f(x) = 10X + 20
f(x) = 2X + 4

f(-7) = 2×(-7) + 4 = -14+4 = -10
jwb. b