jika f(2x+1)=(x-2)(x+3), maka nilai f(15)

jawab

f(2x + 1) = (x -2)(x + 3)

f(15) = 
2x+ 1= 15
2x = 14
x  = 7

f(15) = (7-2)(7+3)
f(15) = (5)(10)
f(15) = 50

dik : f(2x+1) = (x-2)(x+3)

dit : f(15) ??

jawab :
f(2x+1) = 15
2x = 15-1
2x = 14
x = 7

jadi,
f(15) = (7-2)(7+3)
= 5 × 10
= 50

semoga membantu..
.