show that the square of any odd integer is odd, use this fact to justify the statement "if p2 is even , then p is also even
A good first step is noticing that ... -5 = 2*(-3) + 1 -3 = 2*(-2) + 1 -1 = 2*(-1) + 1 1 = 2*0 + 1 3 = 2*1 + 1 5 = 2*2 + 1 ...