Question

Please help it’s needed

Answer 1

`\\ \sf\longmapsto f(x)=4x^2-5x`

`\\ \sf\longmapsto g(x)=3x^2+6x-4`

Now

`\\ \sf\longmapsto (f-g)(x)`

`\\ \sf\longmapsto f(x)-g(x)`

`\\ \sf\longmapsto 4x^2-5x-(3x^2+6x-4)`

`\\ \sf\longmapsto 4x^2-5x-3x^2-6x+4`

`\\ \sf\longmapsto x^2-11x+4`

Answer 2

very easy

`\displaystyle\ (f-g)(x)=f(x)-g(x)=4x^2-5x-3x^2-6x+4=\boxed{x^2-11x+4}`