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Nomor 2.
Dengan rumus yang sebelumnya:
lim_x⇒∞ √(4x²+4x-3) - √(4x²-20x+25)
= [4-(-20)]/[2√4]
= 24/(2.2) = 24/4
= 6
Nomor 3.
Sama,
lim_x⇒∞ √(9x²-6x-1)-√(9x²+6x+1)
= [-6-6]/[2√9]
= -12/(2.3) = -12/6
= -2