If x(a) = a^2+2a-1, then x(8)-x(5) =
a. 43
b. 45
c. 14
d. 3

• sorry its 45
  
  x(a) = a^2+2a-1
  x(8) = 8^2 + 2(8) -1
  =>64 + 16 - 1 = 79
  
  x(5) = 5^2 + 2(5) -1
  => 25 + 10 - 1 = 34
  
  x(8) - x(5) = 79 - 34 = 45
  
  Ans : 45
  
  
  
• 10 years agoHelpfull: Yes(16) No(2)
• 45
  x(8)-x(5) =79-34=45
• 10 years agoHelpfull: Yes(4) No(1)
• x(8)-x(5)=64+16-1-(25+10-1)=45
• 10 years agoHelpfull: Yes(2) No(1)
• x(8) = 64 + 16 - 1 = 79
  x(5) = 25 + 10 - 1 = 34
  79 - 34 = 45
  ans>>>>>>>45
• 10 years agoHelpfull: Yes(1) No(1)
• x(a) = a^2+2a-1 ----(1)
  put a=8 in equ (1) we get , x(8) = 8^2+2(8)-1 =79
  put a=5 in equ (1) we get , x(5) = 5^2+2(5)-1 =34
  x(8)-x(5) = 79-34= 45
  ANSWER : OPTION : b. 45
  
• 10 years agoHelpfull: Yes(1) No(0)
• answer is 45
• 9 years agoHelpfull: Yes(1) No(0)
• x(a) = a^2+2a-1
  x(8) = 8^2 + 2(8) -1
  =>64 + 16 - 1 = 47
  
  x(5) = 5^2 + 2(5) -1
  => 25 + 10 - 1 = 14
  
  x(8) - x(5) = 47 - 14 = 33
  
  Ans : 33
• 10 years agoHelpfull: Yes(0) No(15)
• b.45
  x(8)=8^2+2*8-1 x(5)=5^2+2*5-1
  =64+16-1 =25+10-1
  =64+15 =25+9
  =79 =34
  =x(8)-x(5)
  =79-34
  =45
• 10 years agoHelpfull: Yes(0) No(1)
• x(8)-x(5)=45
• 10 years agoHelpfull: Yes(0) No(1)
• its 45
  x(8)=(8)^2+2(8)-1=79
  x(5)=(5)^2+2(5)-1=34
  x(8)-x(5)=79-34=45
  
• 10 years agoHelpfull: Yes(0) No(1)
• 8^2+2(8)-1 - 5^2+2(5)-1
  =(64+16-1) - (25+10-1)
  =79 - 34
  =40
• 10 years agoHelpfull: Yes(0) No(4)
• 45
  x(8)=79
  x(5)=34
  ans is minus of two above
  
• 10 years agoHelpfull: Yes(0) No(1)
• answr b
  8^2+2(8)-1-5^2-2(5)+1=45
• 9 years agoHelpfull: Yes(0) No(0)
• 45
  x(a) = a^2+2a-1
  x(8) = 8^2 + 2(8) -1
  =>64 + 16 - 1 = 79
  
  x(5) = 5^2 + 2(5) -1
  => 25 + 10 - 1 = 34
  
  x(8) - x(5) = 79 - 34 = 45
  
  
• 9 years agoHelpfull: Yes(0) No(0)
• given that x(a)=a^2+2a-1
  so
  x(8)=64+16-1=79
  x(5)=25+10-1=34
  x(8)-x(5)=79-34=45
  option a)45 is the ans
• 9 years agoHelpfull: Yes(0) No(0)
• ans is b. 45
• 8 years agoHelpfull: Yes(0) No(0)
• x(8)=79
  x(5)=34
  so 79-34=45
• 6 years agoHelpfull: Yes(0) No(0)
• x(8)=79
  x(5)=34
  79-34=45
• 6 years agoHelpfull: Yes(0) No(0)