Question

Jika f(x) = x²-2x -17, nilai f(5) - 3f(2)= ????

Answer 1

F(x) = xkuadrat - 2x - 17 
f ( 5 ) = 25 - 10 - 17 = -2
f ( 2 ) = 4 - 4 - 17 = - 17
3 f ( 2 ) = - 51 
-2 - ( - 51 ) = 49

Answer 2

F(5) - 3f(2) = [ - 2(5) - 17] - 3[- 2(2) - 17
               = (25 - 10 - 17) - 3 (4 - 4 - 17)
               = -2 - 12 + 12 + 51 
               = 49