yang bisa tolong dong bantuannya....kalo bisa...saya sekalian mau tanya tanya

[tex]f(t) = 2 {t}^{2} [/tex]
a.
[tex] \frac{f(1.2) - f(1)}{1.2 - 1} = \frac{2 {(1.2)}^{2} - 2 {(1)}^{2} }{0.2} \\ = \frac{2.88 - 2}{0.2} \\ = 4.4[/tex]
b.
[tex] \frac{f(1 + h) - f(1)}{h} = \frac{2 {(1 + h)}^{2} - 2 {(1)}^{2} }{h} \\ = \frac{2 {h}^{2} + 4h}{h} \\ = 2h + 4[/tex]
c.
kita fokus pd pecahannya dulu
[tex] \frac{f(3 + h) - f(3)}{h} = \frac{2 {(3 + h)}^{2} - 2 {(3)}^{2} }{h} \\ = \frac{2 {h}^{2} + 12h }{h} \\ = 2h + 12[/tex]
masukkan ke dalam limit :
[tex]lim \: \: 2h + 12 \\ h - > 0 \\ \\ = 2(0) + 12 \\ = 12[/tex]
mohon maaf apabila terdapat kesalahan