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= √(4x²+4x+1) + √(9x² + 6x) - 5√(x² - 3/5 x)
= √(4x²+4x+1) - 2√(x² - 3/5 x) + √(9x² + 6x) - 3√(x² - 3/5 x)
= {√(4x²+4x+1) - √(4x² - 12/5 x)} + {√(9x² + 6x) - √(9x² - 27/5 x)}
L i m √(4x²+4x+1)+√(9x² + 6x)-√(25x² - 15x)
x⇒∞
= L i m {√(4x²+4x+1) - √(4x² - 12/5 x)} + L i m {√(9x² + 6x) - √(9x² - 27/5 x)}
x⇒∞ x⇒∞
Perhatikan setiap koefisien x dan koefisien x² yang ada dalam akar
= 4 - (-12/5) + 6 - (27/5)
2√4 2√9
= 20/5 + 12/5 +30/5 + 27/5
4 6
= 32 + 57
20 30
= 96 + 114
60
= 210
60
= 7/2