Jawabanmu

2014-05-08T11:07:38+07:00
f(x)=x^2-2x
g(x)=3x+4
h(x)= -5x+7
(f。g。h) (x) = fog(-5x+7)
(f。g。h) (x) = f[3(-5x+7) + 4]
(f。g。h) (x) = f(-15x+25)
(f。g。h) (x) = (-15x+25)^2 - 2(-15x+25)
(f。g。h) (x) = 225x^2 - 750x + 625 + 30x - 50
(f。g。h) (x) = 225x^2 - 720x + 575
(f。g。h) (-2) = 900+1440+575 = 2915