If (2x + 1) times (x + 2) is an odd integer, then x must be:  Choose the correct choice from the following answers
A) an odd integer B) an even integer C) a prime number D) a composite number E) a negative integer
Solution:   (2x + 1) times (x + 2) means (2x + 1)(x + 2)   (2x + 1)(x + 2) = 2x^2+5x+2   For 2x^2+5x+2 to be odd, 5x+2 must be odd since 2x^2 is always even.   So 5x must be odd, hence x must be odd.   Therefore x is an odd integer.   an odd integernswer: an odd integer
<result>A</result>
If (2x + 1) times (x + 2) is an odd integer, then x must be: