(3x2-4)+(-6x2+9x)

Question

(3x2-4)+(-6x2+9x)

anonymous · Answer

Is the 2 in both parenthesis supposed to be to the power of 2 or times 2?? That is all I need to know first. :)

anonymous · Answer

Assuming it is, flip the + to a - and reverse the signs in the second parenthesis.

So you end up with....
3x^2 - 4 - 6x^2 - 9x

I'm going to start by putting like terms together to make it a little neater...

3x^2 - 6x^2 - 9x -4

Now subtract like terms in this problem our only like terms are 3x^2 and 6x^2. 
3x^2 - 6x^2 = -3x^2
-9x is alone
-4 is alone

So you finally end up with
-3x^2  -9x - 4

Cheers

anonymous · Answer

-3x^2+9x-4 I disagree. Since the + sign is in front of the parentheses and the 9x is already positive, it stays positive.

solomonzelman · Answer

Oh, I see! I always misread the Q...

anonymous · Answer

Whoops, you're right @grahamfuls. Sorry about that, @SolomonZelman