Jawabanmu

2014-04-20T12:57:35+07:00
Y² = 4x → x = ¼y²
y = 2x-4 → x = ½y + 2
ttk potong (1,-2) dan (4,4)
integral dari y = -2 sampai y = 4
L = ∫ (½y + 2 - ¼y²) dy
…………………….…4
= ¼y² + 2y - (1/12)y³│
……………………....-2
= ¼(4)² + 2(4) - (1/12)(4)³ - (¼(-2)² + 2(-2) - (1/12)(-2)³)
= 4 + 8 - 64/12 - (1 - 4 + 8/12)
= 9 satuan luas
1 4 1