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f(X) = a (bx+1) pangkat -1/2
f'(X) = a. (-1/2). (bx+1) pangkat -3/2 . (b)
= (-1/2) ab per (bx+1) pangkat 3/2
jika f'(0)= -8, maka
f'(0)= (-1/2).ab per (1) pangkat 3/2
-8 = (-1/2) ab per 1
-8 = (-1/2) ab
ab = 16
jadi :
√ab = √16 = 4 (B)
7) f(X) = (3 X kuadrat - 6) pangkat 4/5
f'(X) = (4/5). (3 X kuadrat - 6) pangkat -1/5 . (3.2X)
= (4/5) (6x) per (3 X kuadrat - 6) pangkat 1/5
= 24x per 5. (3 X kuadrat - 6) pangkat 1/5
= 24x per 5 Kali akar 5 (3 X kuadrat - 6)
jawabannya
D