Respuesta :

It's the 3rd option. All your doing to me, is adding all the numbers straight down. I think you meant to write it like this: 8x² - x - 4

When we do the sum of [tex]f(x)=5x^2-2x[/tex] and  [tex]g(x)=3x^2+x-4 .[/tex] the result is  [tex]8x^2-x-4[/tex].

Given,

[tex]f(x)=5x^2-2x[/tex]

[tex]g(x)=3x^2+x-4[/tex]

We have to calculate [tex]f(x)+g(x)[/tex].

On adding both the functions we get,

[tex]f(x)+g(x)=5x^2-2x+3x^2+x-4[/tex]

[tex]f(x)+g(x)=8x^2-x-4[/tex].

Hence option c is correct [tex]f(x)+g(x)=8x^2-x-4[/tex].

For more details on functions follow the link:

https://brainly.com/question/5245372