Evaluate (without using de L'Hôpital Rule)
limx→−3√3x2+10x+4−√x2+3x+1√5x2+11x+5−√2x2+x+2=58√17
I have to evaulate the limit of this function as it approaches −3. I have tried plugging it in but I get 0/0. Then I tried LCD, but the √x−√y does not equal √x−y. Then I tried multiplying the conjugate of the denominator but after all of that I still get 0/0. I cannot use the calculator except to check my answers after completion. However when I checked there is a limit at −3 so I resorted to looking online and it gave me the answer 58√17, but I cannot seem to get this answer without using L'Hôpital's rule.
Answer
Hint 1) √a−√b√c−√d=(a−b)(√c+√d)(c+d)(√a+√b)
Hint 2) 2x2+7x+3=(2x+1)(x+3), this is a+b
Hint 3) Try hint 2) with c+d.
What do you get?
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