Question

Subtract - 7x2 + 1 from -2x2
- 4x.

Answer 1

`5x^2-4x-1`

Explanation:

I am assuming you mean
`(-2x^2-4x)-(-7x^2+1)`

If so, then the negative outside and inside the fraction flips the sign inside, therefore
`-(-7x^2+1)= 7x^2-1`

After that, we simply combine like terms.

`-2x^2+7x^2=5x^2\\=5x^2-4x-1`