For all integers a and b, a%b = (a + b)(a - b). If 5%x = 21, then which of the following could be a value of x?
Choose the most appropriate option:
A) -4  B) -3  C) 2  D) 3  E) 6
5%x = (5+x)(5-x)   25-x^2 = 21   x^2 = 4   x=-2,2   Ans: 2
<result>C</result>
For all integers a and b, a%b = (a + b)(a - b). If 5%x = 21, then which of the following could be a value of x?