is this correct?
problem states to find the difference
problem= (7x^3 - 6x^2 + 6) - (2x^2 - 4x -9)
my answer is = 7x^3 - 8x^2 + 6 + 16

Question

is this correct?
problem states to find the difference
problem=>  (7x^3 - 6x^2 + 6) - (2x^2 - 4x -9)
my answer is => 7x^3 - 8x^2 + 6 + 16

anonymous · Answer

WHere did the 4x go?

anonymous · Answer

(7x^3 - 6x^2 + 6) - (2x^2 - 4x - 9)

7x^3 - 6x^2 + 6 - 2x^2 + 4x + 9
Can you solve it now?

anonymous · Answer

?  i lost it.. then it sould be ? 7x^3 - 8x^2 + 4x + 15

anonymous · Answer

Yup. The only purpose of the parentheses is to show that you have to distribute the -1 to the entire trinomial. See what I did? You distributed the negative?

anonymous · Answer

yes i have one more to see if it is done right can i post here?

anonymous · Answer

Sure.

anonymous · Answer

add the polynomials 
=> problem is (3x^2 - 5x - 7 ) + (9x^3 + 4x^2 - 9)
my answer was => -9x^3 + 7x^2 - 5x - 16

anonymous · Answer

So close.
9x^3 + 7x^2 - 5x - 16

anonymous · Answer

thats what i had posted is theat wrong? if so please show me how to get it

anonymous · Answer

You got it, but there is an unnecessary negative. Probably a typo?

anonymous · Answer

oh i c it now you are correct it is not supposed to be -9 thanks for pointing that out to me. appreciate it.

anonymous · Answer

You're welcome :)

anonymous · Answer

i am gonna hang it up for the night. appreciate it

anonymous · Answer

Anytime. :)