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f(x) = u.v
f'(x) = u' . v + u . v'
Langkah pertama : mencari u' dan v'
u = x^2 -2x +3
u' = 2x - 2
v = 2x - 1
v' = 2
Langkah kedua : mencari turunan
f(x) = (x^2 - 2x + 3)(2x - 1)
f'(x) = 2x-2(2x-1) + (x^2 -2x+3) 2
Kita kali pelangi
f'(x) = 4x^2 -2x -4x + 2 + 2x^2 - 4x + 6
Kita atur sesuai, agar rapi
f'(x) = 4x^2 + 2x^2 -2x -4x -4x + 2 + 6
f'(x) = 6x^2 -10x + 8
Langkah ketiga : mencari f'(2)
f'(2) = 6(2)^2 - 10(2) + 8
f'(2) = 6(4) - 20 + 8
f'(2) = 24 - 20 + 8
f'(2) = 12
semoga membantu