Answer:
[tex]-12x^2-4x+40[/tex]
Step-by-step explanation:
We have been given a polynomial [tex]??-(20-4x-5x^2)=20-7x^2[/tex]. We are asked to find the missing polynomial.
To find our missing polynomial, we will add [tex](20-4x-5x^2)[/tex] on both sides of our equation as:
[tex]??-(20-4x-5x^2)+(20-4x-5x^2)=20-7x^2+(20-4x-5x^2)[/tex]
Using distributive property, we will get:
[tex]??=20-7x^2+20-4x-5x^2[/tex]
Upon combining like terms, we will get:
[tex]??=-7x^2-5x^2-4x+20+20[/tex]
[tex]??=-12x^2-4x+40[/tex]
Therefore, the missing value of our given polynomial is [tex]-12x^2-4x+40[/tex].
