# math

posted by
**raluca**
.

simplify:

7y-3y-x^2+4x^2

how do i add x^2 to 4x^2?

what will the result be?

i know that 2x^2-x^2 = x^2....but not how to do the above

posted by
**raluca**
.

simplify:

7y-3y-x^2+4x^2

how do i add x^2 to 4x^2?

what will the result be?

i know that 2x^2-x^2 = x^2....but not how to do the above