cepet dong nanti do jadikan jawaban terbaik Dan mendapatkan poin banyak, ayo Yang jago matematika merapat

1
jika f(x) = 8x - 4
maka
f '(x) = LIM(h⇒0) ( f(x+h) - f(x) ) / h
= LIM(h⇒0) ( 8(x+h) - 4 - 8x + 4 ) / h
= LIM(h⇒0) ( 8h ) / h
= 8

2.
jika f(x) = x² + 3x
maka
f '(x) = LIM(h⇒0) ( f(x+h) - f(x) ) / h
= LIM(h⇒0) ( (x+h)² + 3(x+h) - x² - 3x ) / h
= LIM(h⇒0) ( x² + 2xh + h² + 3x + 3h - x² - 3x ) / h
= LIM(h⇒0) ( 2xh + h² + 3h ) / h
= LIM(h⇒0) ( 2x + h + 3 )
= 2x + 3

3.
jika f(x) = x² - 2x + 6
maka
f '(x) = LIM(h⇒0) ( f(x+h) - f(x) ) / h
= LIM(h⇒0) ( (x+h)² - 2(x+h) + 6 - x² + 2x - 6 ) / h
= LIM(h⇒0) ( x² + 2xh + h² - 2x - 2h + 6 - x² + 2x - 6 ) / h
= LIM(h⇒0) ( 2xh + h² - 2h ) / h
= LIM(h⇒0) 2x + h - 2
=  2x - 2

semoga cukup jelas dan membantu