(9c2−3cw−6w2)−(−9c2+9cw−w2)

The answer is --

Step-by-step explanation:

The first thing you want to do is to add the to the other one. You add instead of subtracting because the second one has a minus sign, and there is a minus sign in front of the parentheses. Two minus' make a plus. Adding these two together gives you a sum of .

Next, you want to simplify 9cw. Remember that since 9cw is positive, and there is a minus sign if front of the parentheses, you need to subtract here. Subtracting 3cw and 9cw gives you a difference of . The new equation is .

Finally, we need to combine -w2 with -6w2. Remember that -w2 has a minus sign in front of it, so you need to add w2 to -6w2. This gives you . You combine this answer with the two answers above, and you get: . I hope this helps.

its c or d   take a lucky guess my dude