Ireally need with this equation as soon as possible : d subtract (x-3x^4++4x^6)

The subtraction sign in front of the second set of parenthesis changes the signs on the terms inside those parenthesis.  So this could be rewritten as  .  None of the exponents on the x are the same, so we will just express it in terms of descending powers of x.   .   This is also the same as    if you don't like to start with a negative.  Either one is correct.

What’s your question.