Question

The sum of two trinomials is 7x2 - 5x + 4. If one of the trinomials is 3x2 + 2x - 1, then what is the other trinomial?

Answer 1

Answer:   4x^{2} - 7x + 5

Step-by-step explanation:

Let y be the number

$3x^{2} +2x - 1 + y = 7x^{2} - 5x + 4$

                       $y = 7x^{2} - 5x + 4 - 3x^{2} - 2x + 1$

                       $y = 4x^{2} - 7x + 5$