Question

what must be added to 2x^2-4x+9 to get 5x^2-13

Answer 1

Let the number be y
ATP
2x^2 -4x +9 +y = 5x^2 - 13
=> y = 5x^2 -13 - 2x^2 +4x -9
=> y = 3x^2 +4x - 22
The expression is 3x^2 + 4x -22

Answer 2

hey friend here is your answer

let. we. add. X

2x²-4x+9+X=5x²-13

X=5x²-13-2x²+4x-9=3x²+4x-22

we add 3x²+4x-22

hope it's helps