if (p/q)-(q/p)=21/10
then what ia the value of(4p/q)+(4q/p)
options:
1. 58/5
2. 59/5
3.121/105

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• 9 years agoHelpfull: Yes(21) No(7)
• p/q =a then q/p = 1/a
  a+1/a=21/10
  by solving this we get a=5/2
  then 4*5/2+4*2/5 = 58/5 (Answer)
• 9 years agoHelpfull: Yes(18) No(1)
• let p/q=a then q/p=1/a
  a - (1/a)=21/10
  (a^2 -1)/a=21/10
  10(a^2)-10=21a
  10(a^2)-10-21a=0
  10(a^2)-25a+4a-10=0
  5a(2a-5)+2(2a-5)=0
  5a+2=0 ; 2a-5=0
  
  2a-5=0
  a=5/2
  
  =>4(5/2)+4(2/5)
  (20/2)+(8/5)
  (100+16)/10
  =>58/5
  
• 9 years agoHelpfull: Yes(11) No(0)
• apply the formula (a-b)^2 =(a+b)^2+4ab
  
  u will get 58/5
  i did it...answer is 58/5
• 9 years agoHelpfull: Yes(3) No(9)
• I think answer is option 1. 58/5
• 9 years agoHelpfull: Yes(2) No(1)
• can anyone suggest how to prepare for tcs off capus which is on 2nd???
• 9 years agoHelpfull: Yes(2) No(0)
• how will we know dat we are shortlisted for tcs test which is going to be held in 2nd march...i got the mail that "your detail is under validation".
• 9 years agoHelpfull: Yes(2) No(0)
• Yes, I got
• 9 years agoHelpfull: Yes(1) No(0)
• plz explain how it is 58/5
• 9 years agoHelpfull: Yes(1) No(1)
• yes i can receive
• 9 years agoHelpfull: Yes(1) No(2)
• just check it out in tcs next step portal @annu priya
• 9 years agoHelpfull: Yes(1) No(0)
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• 9 years agoHelpfull: Yes(0) No(0)
• Let p/q = a, then (a - 1/a) = 21/10
  ⇒a2−1=a.2110
  ⇒10a2−21a−10 = 0
  Roots of the equation = −b±b2−4ac−−−−−−−√2a
  a = 21±441+400−−−−−−−−√20
  a = 21±2920 = 5/2 or -2/5
  For a = 5/2, 4p/q+4q/p = 58/5
  For a = -2/5, 4p/q+4q/p = -58/5
• 9 years agoHelpfull: Yes(0) No(0)
• Let p/q = a, then (a - 1/a) = 21/10
  ⇒a2−1=a.2110
  ⇒10a2−21a−10 = 0
  Roots of the equation = −b±b2−4ac−−−−−−−√2a
  a = 21±441+400−−−−−−−−√20
  a = 21±2920 = 5/2 or -2/5
  For a = 5/2, 4p/q+4q/p = 58/5
  For a = -2/5, 4p/q+4q/p = -58/5
• 8 years agoHelpfull: Yes(0) No(0)
• (P/q)-(q/p)=21/10
  
  Solve it (p^2-q^2)/pq=21/10
  
  Pq gives 10 it means values can be 5 and 2
  And 5 and 2 satifies p^2-q^2 which is 21
  So p=5 and q=2
  
  Now 4×(5/2 + 2/5)
  
  Gives ans 58/5.
• 8 years agoHelpfull: Yes(0) No(1)
• let us take p/q=x and q/p=1/x
  x-1/x=21/10
  then by solving we get a quadratic equation like 10x^2-10-21x=0
  10x^2-25x+4x-10=0
  then by taking factors we get two values for x,x=-2/5 and x=5/2
  by substituting x=5/2
  4(5/2)+4(2/5)=58/5
• 5 years agoHelpfull: Yes(0) No(0)
• Take p/q as x. so x-1/x=21/10. from there find x and get 5/2 and put it in the form get the answer it will be 58/5
• 5 years agoHelpfull: Yes(0) No(0)