Four of the following five parts numbered (1), (2),(3),(4) and (5) are exactly equal. Which part is not equal to the other four parts? The number of that part is your answer.

1) 2x(x+5)+12
2) 2x(x+3)+3(x+4)+x
3)(x+3)2+(x+1)(x+3)
4)(x+1)(2x+3)+2(x+3)

5) 2(x+1)(x+3)+2(x+3)

• 1,2 and 5 are same equations 2x^2+10X+12 the solution of this eqn. x=-3,-2
  3 is x^2+6x+9=0 solution x=-3
  4 is 2x^2+7x+9=0 gives no real solution of x
  answer is 4
• 11 years agoHelpfull: Yes(7) No(1)
• 4)(x+1)(2x+3)+2(x+3) is not equal to other parts.
  
  as value of constant in other expressions is 12
  but in this case, value of constant is 9.
• 12 years agoHelpfull: Yes(6) No(7)
• answer is 4)(x+1)(2x+3)+2(x+3)
  1,2,3 and 5 are same equations. Because,
  2x^2+10X+12 the solution of this eqn. x=-3,-2
  Substitute x=-3 in 1,2,3,4,5
  1=> 2(-3)(-3+5)+12=0
  2=>2(-3)(-3+3)+3(-3+4)+-3=0
  3=>(-3+3)2+(-3+1)(-3+3)=0
  4=>(-3+1)(2(-3)+3)+2(-3+3)=6
  5=>2(-3+1)(-3+3)+2(-3+3)=0
  So ans is option 4
  
• 10 years agoHelpfull: Yes(1) No(0)