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For a positive integer x, the function f(x) is defined as f(x)=2x2+3x+4
. Is the value of the function f(x) an even number?
  1. x is a multiple of 3
  2. x is a prime number
  • a)
    Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.
  • b)
    Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.
  • c)
    BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.
  • d)
    EACH statement ALONE is sufficient to answer the question asked.
  • e)
    Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
For a positive integer x, the function f(x) is defined as f(x)=2x2+3x+...
Step 1 & Step 2: Understanding the Question statement and Drawing Inferences
  • The function f(x) is defined as f(x)=2x2+3x+4, where x ≥ 1
  • Now in function f(x), we have three terms being added
  • 1st part: 2x2
    • Now any number multiplied by 2 will always result in an even number.
    • So 2x2 will always be even
  • 2nd part: 3x
    • 3x will be even, when x is even.
    • This is so because, 3 is an odd number and if x → even number, it will result in od dnumber * even number=even number
    • 3x will be odd, when x is odd.
    • This is so because, 3 is an odd number and if x → odd number, it will result in odd number*odd number=odd number
  • 3rd part: 4
    • 4 will always be even
  • Now, 2x2+4=evennumber+evennumber=evennumber
  • So, for f(x) to be even → 3x should be even
  • 3x would be even in cases when x is even (Already established above)
  • So we have to ultimately find the even-odd nature of x to find whether f(x) is even or not.
 
Step 3: Analyze statement 1 independently
Statement 1:
  • x is a multiple of 3.
  • So x can be even (Example: 6) or it can be odd (Example :3)
  • So, we will not be able to determine the nature of x whether it is even or odd,
  • Hence won’t be able to tell whether function f(x) will give an even value or not.
  • Hence statement 1 is not sufficient to answer the question
 
Step 4: Analyze statement 2 independently
Statement 2:
  • x is a prime number.
  • So x can be an even prime number ‘2’ or it can be odd prime number like 3, 5,7.
  • So, we will not be able to determine the nature of x whether it is even or odd
  • Hence won’t be able to tell whether function f(x) will give an even value or not.
  • Hence statement 2 is not sufficient to answer the question.
     
Step 5: Analyze the two statements together
  • From statement 1, we have x is a multiple of 3
  • From statement 2, we have x is a prime number and thus can be {2,3,5,7,….}
  • Only one number 3’ will satisfy both the statements because the number ‘3’ is a multiple of 3 and is also a prime number. All other numbers except ‘3’ will be multiple of 3 and hence will not be prime.
  • Now when x=3, f(x) will be odd, hence its value will not be an even number.
  • So by combining both statements we are able to arrive at a unique answer.
  • Hence the correct answer is option C- Both statements together are necessary to arrive at a unique answer.
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For a positive integer x, the function f(x) is defined as f(x)=2x2+3x+4. Is the value of the function f(x) an even number? x is a multiple of 3 x is a prime numbera)Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.b)Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.c)BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.d)EACH statement ALONE is sufficient to answer the question asked.e)Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.Correct answer is option 'C'. Can you explain this answer?
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