Perform the indicated operation: (x^2-5x+8)-(-2x^2+x-7)-x^2+4x-1)?

Answer 1

All I see is:
"Perform the indicated operation: (x^2-5x+8)-(-2x^2+x-7)-x^2+4x-... " so if there's more, I can't help you.

Since you're essentially adding polynomials, I'll explain using what I can see.

When adding polynomials, you can combine expressions that have the same variable component. For example:

(x^2-5x+8)-(-2x^2+x-7)
1.) Perform the operations and remove parenthesis.
x^2 - 5x + 8 + 2x^2 - x + 7
2.) Rewrite the expression to group similar portions of the polynomial together - x^2 with x^2, x with x, for example.
x^2 + 2x^2 - 5x - x + 8 + 7
3.) Add similar portions togther. x^2 + 2x^2 = 3x^2, for example. You cannot add dissimilar expressions: x^2 + x cannot be combined.
3x^2 - 6x + 15