1. Add or Subtract. (4x^2+15x-3)-(-3x^2+5)

well apparently to add first part of parenthesis will actually be 19*+2+3=24*,

and the subtracting part of the first part of the parenthesis will actually be 19*-2-3=14*, the other part will actually be 5*+5=10* or 3*+2+5=10*.(Now they may be the same but both of them are different look at the first numbers)and for subtracting on that is 5*-5=0* or 3*-2-5=0*(now they may look wrong but look at the equalization adding and the subtract)
add:24*
+10*=34*
subtract:14*-0*=14*
hope these answers are right and I actually worked them out

To add or subtract polynomials, you need to combine the like terms.

In the given question, we have:

(4x^2 + 15x - 3) - (-3x^2 + 5)

To simplify this expression, we can remove the parentheses and then combine the like terms:

Note: When subtracting a negative number, it is the same as adding a positive number.

= 4x^2 + 15x - 3 + 3x^2 - 5
= (4x^2 + 3x^2) + 15x - 3 - 5

Now, we can combine the like terms:

= 7x^2 + 15x - 8

Therefore, the simplified expression is 7x^2 + 15x - 8.