mohon bantuannya kakak
u = 7x-5 --> u' = 7
v = 8x+2 --> v' = 8
f'(x) = (u'.v - v'. u) /v²
f'(x) = (7.(8x+2) - 8(7x-5)/(8x+2)²
f'(x) = (56x+14 -56x+40)/(8x+2)²
f'(x) = 54/(8x+2)²
f'(4) = 54/(8.4+2)²
f'(4) = 54/(34)²
f'(4) = 54/1156
f'(4) = 27/578
[answer.2.content]
