If (2x + 1) times (x + 4) is an odd integer, then x must be: Choose the correct choice from the following:
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 + 4) means (2x + 1)(x + 4)   (2x + 1)(x + 4) = 2x^2+9x+4   For 2x^2+9x+4 to be odd, 9x+4 must be odd since 2x^2 is always even.   So 9x 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 + 4) is an odd integer, then x must be: