Di ketahui fungsi g(x) = px + q. Jika g(2) = -3 dan g(-3) =22, nilai dari g(5) – g(-1) adalah…
Jawaban:
g (2) = 2p + q = -3
g(-3) = -3p + q = 32
___________-
5p = -35
p = -7
2p + q = -3
2(-7) + q = -3
-14 + q = -3
q = -3 + 14
q = 11
> g(5) = -7(5) + 11 = -35 + 11 = -24
> g(-1) = -7(-1) + 11 = 7 + 11 = 18
> g(5) – g(-1) = -24 – 18 = -42
g(2) = -3
g(-3) = 22
(2 – (-3)) p = -3 -22
5p = – 25
p = – 5
g(2) = – 3
q= – 3 - 2p
q = -3 + 10
q = 7
g(x) = -5 x + 7
g(5) = -5(5) + 7 = – 25 + 7 = -18
g(-1) = -5 (-1) + 7 = 5 + 7 = 12
g(5) – g(1) = – 18 – (-12) = -6