SOLUTION: can you please assist me with solving problem...instructions... 7x^2 + 5x from 9x^2

SOLUTION: can you please assist me with solving problem...instructions... 7x^2 + 5x from 9x^2 - 3.

Question 71691: can you please assist me with solving problem...instructions...
7x^2 + 5x from 9x^2 - 3.
Answer by bucky(2189) (Show Source): You can put this solution on YOUR website!
7x^2 + 5x from 9x^2 - 3
.
The word "from" indicates to me that you are being asked to subtract from
.
.
The rule of subtraction is that you change all the signs of the terms in the "take away"
polynomial, and then add the result to the "take from" polynomial.
.
In this case the "take way" polynomial is . Change the signs to get:
.
.
.
Then add this to the "take from" polynomial which is
.
You can only add numbers to numbers and can only add together terms with like powers of x.
In this case we can add the and the terms to get (((+ 2x^2))).
That's one part of the answer.
.
Next we have and we need to add it to the "take from" polynomial. There is no
corresponding term with just an x in the "take from" polynomial, so the
simply adds into the answer set unchanged. So far our answer is .
We have a -3 in the "take from" polynomial but there is no corresponding plain-old
number in the "take away" polynomial to add it to. Therefore -3 appears in the answer set
unchanged.
.
So by combining all the terms in the answer we get an answer of .
.
Hope this helps you to understand the problem and the subtraction process a little better.
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