What is the first degree expression to be added to`16x^6 + 8x^4 - 2x^3+ x^2 + 2x + 1` in order to make it a perfect square?

What is the first degree expression to be subtracted from x^(6)+8x^(4)+2x^(3)+16x^(2)+4x+5 in order to make it a perfect square? ( i -4x-4 (ii) 4x+4( iii) 4x-4( iv )-4x+4

Which of the following is to be added to make x^(6) -6x^(4) + 4x^(3) + 8x^(2) - 10x + 3 a perfect square ?

The number which is added with x^2 + x to make addition a perfect square is

Which of the following must be added to x^2-2x+1/2 to make the result a perfect square?

What should be added to the expression x (x + a) (x + 2a) (x + 3a) so that the sum may be a perfect square ?

Find the sum of squares of roots of the equation 2x^4 - 8x^3 + 6x^2 - 3=0