Subtract
1. (18x^6+6x^4+15x^3+4x-8) - (-19x^7-7x^2+10x)
2. (10x^4-7x+7) - (11x^3+8x^2-9)
3. (16x^7+17x^5+20x^3+6x+4) - (20x^7+15x^6+20x^3+6x)
2007-02-01 14:05:44 · 5 answers · asked by katiekcat5 3 in Science & Mathematics ➔ Mathematics
Just match up the like terms and combine them.
Keep the terms in descending order according to the exponents or powers.
Also remember that subtracting a term means change the sign and add. So to subtract -7x^2, for example, change the sign and add 7x^2
In the first one, the only like terms are 4x and 10x.
So that would be ...
19x^7 + 18x^6 + 6x^4 + 15x^3 + 7x^2 - 6x - 8
Try the others the same way....
(I see this got a thumbs down after I put in the first line and came back and finished. Did you put the thumbs down? If so, you'll never see this work that I did for you. And you'll probalby fail. )
2. The only like terms in this are the constants at the end...
10x^4 - 11x^3 - 8x^2 - 7x + 16
3. Here the like terms are the ones involving the 7th power, the third power, and the x (linear term)...
-4x^7 - 15x^6 + 17x^5 + 4
(notice how some of the the like terms cancelled out. Can you see why?)
I don't see how if you don't get this done you will fail; even if you get it done, if you don't understand, you will still fail. Math is not just about getting the right answer, it is also about understanding how to get the right answer so that you can do it again. Otherwise you can't replicate your results, and science depends on replicable results.
So I can see how if you don't understand it you will fail. And if you try the others, try and get the same solutions as others here will probalby give you (or find them wrong, as happens sometimes on YA), you will understand, and you will pass, and that will affect your future.
2007-02-01 14:08:43 · answer #1 · answered by Joni DaNerd 6 · 0⤊ 1⤋
don't forget to change the signs in the right hand term:
(18x^6+6x^4+15x^3+4x-8) - (-19x^7-7x^2+10x) =
(18x^6+6x^4+15x^3+4x-8 +19x^7+7x^2-10x)
2007-02-01 14:12:52 · answer #2 · answered by The man in the back 4 · 0⤊ 0⤋
You could simplify using derivatives
1. (108x^5+24x^3+45^2+4)-(-133x^6-14x+10)
2. (40x^3-49)-(33x^2+16x)
3. (112x^6+85x^4+60x^2+6)-(140x^6+90x^5+60x^2+6)
Combine like terms
I dont see the point to your problems, what math are you taking?
2007-02-01 14:25:49 · answer #3 · answered by K G 2 · 0⤊ 0⤋
match the like terms and write down. It will save your future. Don't worry
2007-02-01 14:12:05 · answer #4 · answered by Mritunjay 2 · 0⤊ 0⤋
So if someone gives you the answer, how is that you getting this done?
2007-02-01 14:09:26 · answer #5 · answered by Anonymous · 0⤊ 1⤋