jika f(×)=x2-2×-17 nilai f(5) - 3 f (2) = a -36 b- 10 c 29 d 49 e 89

f(×)=x²-2×-17
f(5) - 3 f (2) = 5²-2(5)-17 -3(2²-2(2)-17)
                 = 25-10-17-3(4-4-17)
                 = -2-3(-17)
                 = -2+51
                 = 49

f(x)=x2-2x-17
f(5)=5.5-2.5-17
    = -2
f(2)=2.2-2.2-17
    =-17
f(5)-3f(2)
=-2+51
= 49
jawaban : D