Maths-
General
Easy

Question

If x is real, then maximum value of fraction numerator 3 x squared plus 9 x plus 17 over denominator 3 x squared plus 9 x plus 7 end fraction is

  1. 1    
  2. 17 over 7   
  3. 1 fourth    
  4. 41    

The correct answer is: 41


    f open parentheses x close parentheses equals fraction numerator 3 x squared plus 9 x plus 17 over denominator 3 x squared plus 9 x plus 7 end fraction equals fraction numerator 3 x squared plus 9 x plus 7 over denominator 3 x squared plus 9 x plus 7 end fraction plus fraction numerator 10 over denominator 3 x squared plus 9 x plus 7 end fraction equals 1 plus fraction numerator 10 over denominator 3 x squared plus 9 x plus 7 end fraction
F o r space m a x i m u m space v a l u e comma space f apostrophe open parentheses x close parentheses equals 0
f apostrophe open parentheses x close parentheses equals fraction numerator 10 open parentheses 6 x plus 9 close parentheses over denominator 3 x squared plus 9 x plus 7 end fraction
0 equals fraction numerator 10 open parentheses 6 x plus 9 close parentheses over denominator 3 x squared plus 9 x plus 7 end fraction
6 x plus 9 equals 0
6 x equals negative 9
therefore x equals fraction numerator negative 9 over denominator 6 end fraction equals fraction numerator negative 3 over denominator 2 end fraction

A s space x space i s space r e a l comma t h e n space m a x i m u m space v a l u e space o f space f open parentheses x close parentheses space i s
f open parentheses x close parentheses equals 1 plus fraction numerator 10 over denominator 3 x squared plus 9 x plus 7 end fraction equals 1 plus fraction numerator 10 over denominator 3 open parentheses begin display style fraction numerator negative 3 over denominator 2 end fraction end style close parentheses squared plus 9 open parentheses begin display style fraction numerator negative 3 over denominator 2 end fraction end style close parentheses plus 7 end fraction equals 1 plus fraction numerator 10 over denominator open parentheses begin display style 27 over 4 end style close parentheses plus open parentheses begin display style fraction numerator negative 54 over denominator 4 end fraction end style close parentheses plus begin display style 28 over 4 end style end fraction equals 1 plus 40 equals 41

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