diketahui f :x -2x+9 jika f(p) =15, nilai p adalah

f(x) = -2x + 9
f(p) = -2p + 9
15 = -2p + 9
2p = 9 - 15
p = -6/2
p = -3

f(x) : -2x+9
f(p) : 15

-2x+9 = 15
-2x = 15-9
-2x = 6
x = 6/-2
x = -3

f(-3) = 15