What must be added to `3a^3-9a^2+a+8` to obtain `4a^3-3a^2+7a-2`?

What must be added to 9a^3+8a^2-7a+15 to obtain 7a^3-9a^2+11a-6

What must be added to x^(4) - x^(3) + x^(2) + x + 3 to obtain x^(4) + x^(2) - 1 ?

What must be added to 5a , -3b + 2c " to get " 3a - 4b + 7c ?

What must be added to 12 x^3-4x^2+3x-7 to make the sum x^3+2x^2-3x+2?

What should be added to -3a^2b^2c^2+2abc^2+18 to get 7a^2b^2c^2+11abc^2-7

What must be added to 3x^3+x^2-22 x+9 so that the result is exactly divisible by 3x^2+7x-6?

What must be added to 3x^3+x^2-22 x+9 so that the result is exactly divisible by 3x^2+7x-6?

What must be added to x^4+2x^3-2x^2+x-1\ so that the resulting polynomial is exactly divisible by x^2+2x-3.

What must be added to x^4+2x^3-2x^2+x-1 so that the result is exactly divisible by x^2+2x-3.

What must be added to x^4+2x^3-2x^2+x-1 so that the result is exactly divisible by x^2+2x-3.