What should be the value of p if the value of 3x power 2+4x-p is 5, when
a) x = -1
b) x = 1 ??

b,    x = 1

3x(2) + 4x - p = 5
3(1) + 4 (1) - p = 5
3 + 4 - p = 5
 -p = 5 - 4 -3
  -p = 5 - 8
 - p = - 3                              
   p = 3                                   ( - is cancel because both LHS and RHS are in minus sigh )