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h
= lim h->0 3(x² + 4xh + 4h²) - 3x²
h
= lim h->0 3x² + 12xh + 12h - 3x²
h
= lim h->0 h(12x + 12)
h
= lim h->0 (12x + 12)
= 12(0) + 12
= 0 + 12
= 12
Jadi, lim h->0 (f(x+2h)-f(x))/h = 12