Nilai dari lim x mendekati tak terhingga √25x² - 9x - 6 - 5x + 3 adalah.......

Bab Limit
Matematika SMA Kelas XI

lim (√(25x² - 9x - 6) - (5x - 3))
x→∞
= lim (√(25x² - 9x - 6) - √(5x - 3)²)
  x→∞
= lim (√(25x² - 9x - 6) - √(25x² - 30x + 9))
  x→∞
a = 25; b = -9; c = -6; p = 25; q = - 30; r = 9
karena a = p = 25, maka,

(b - q) / (2 √a)
= (-9 - (-30)) / (2 √25)
= (-9 + 30) / (2 x 5)
= 21 / 10

jawabannya C