diketahui f(x) = x2-2x cari dan sederhanakan f(4+h)

f(x) = x² - 2x
f( 4 + h ) =

(4 + h)² - 2(4 + h)
h² + 8h + 16 - 8 - 2h
= h² + 6h + 8

f(4+h) = (4+h)(4+h) - 2(4+h)
f(4+h) = h2+8h+16 - 8 - h
f(4+h) = h2+7h+8

Kyk nya masih ada lagi...