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