What must be added to the sum of `x^2-4x+7` and `2x^2+5x-9` to get 0.​

What must be added to the sum of 2a^(2)-3a+7,-5a^(2)-2a-11 and 3a^(2)+5a-8 to get 0?

What must be added to the polynomial f(x)=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 f(x) = x^4 + 2x^(3) - 2x^(2) +x-1 so that the resulting polynomial is divisible by x^(2) + x+1 ?

From the sum of 3x^2-5x+2 and -5x^2-8x+9 subtract 4x^2-7x+9.

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

What must be added to 9x^(2)-24x+10 to make it a whole square?

What must be added to 9x^(2)-24x+10 to make it a whole square?

What must be added to x^(4)-x^(3)+x^(2)-5x to get x^4-x^2+4?

Subtract the sum of 2x-x^(2)+5 and -4x-3+7x^(2) om 5.