+129850 7a^2 - 6a + 2a^2 + 5a
Remember that we can only add / subtract variables of like powers....let's put those together........
What's 7a^2 + 2a^2 ???
What's -6a + 5a ???
Post your answer......let's see what you have.....
+129850 No....that's not quite correct....let's look at this....step-by-step
7a2 - 6a + 2a2 + 5a
7a^2 + 2a^2 = 9a^2
-6a + 5a = -1a
I see what's giving you problems...it's the signed numbers......let me help you with this
If we have the same signs......we just add the two numbers and keep the sgn.....for instance..
3a + 7a = 10a remember...if there s no sign in front of the number....it's assumed to be positive
Also
-6d - 4d = -10d
If we have different signs, here's the trick :
-9a + 3a
"Forget" the signs
Take the "larger" number and subtract the "smaller" number
The "larger" number here is 9 the "smaler" is 3
Subtract 9 - 3 = 6
What sign was on the larger number??? It was negative......so that's the sign we use in the final answer = -6a
One more
8w - 3w
8 is the larger number.....3 is the smaller 8 - 3 = 5 so ..... 5w is our result
See how to do this ???
+129850 No.....that was just an example problem
7a2 - 6a + 2a2 + 5a
7a^2 + 2a^2 = 9a^2
-6a + 5a = -1a
So the answer to your question is :
9a^2 - 1a
+118667 Hi ipopsie :)
We love it when people interact with answerers like this. It is great. It shows you are really learning and we (CPhill this time) is really teaching.
Thanks CPhill.
When it comes to signs just always remember that the sign belongs to the term directly behind (to the right) of it!.
