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Bab Limit
Matematika SMA Kelas XI

lim √(4x² + 7x + 1) - √(4x² + 4x + 1)
x→∞

a = 4; b = 7; c = 1; p = 4; q = 4; r = 1

karena a = p = 4, maka

(b - q) / (2√a) = (7 - 4) / (2 √4)
                      = 3/(2 . 2)
                     = 3/4

jawabannya A