16.
What must be added to 1 - x + x2 - 2x3³ to get x³?
a)-1+x+x²-3x³
c) none of these
4xy x 5x2y2 x 6x³y³ =?
a) 120xy
c) 120x5y5
b) x3.x²+x-1
d) 3x³-x²+x-1
b) 120x6y6
d) 120