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Subtract. (9x^8+4x^7+7x^6-2) - (7x^8+3x^7+7x^6-2)?
9 Answers
- Polkadot PajamasLv 71 decade agoFavorite Answer
Take off the parentheses first:
9x^8+4x^7+7x^6-2-7x^8-3x^7-7x^6+2
=2x^8+x^7
- PaulLv 71 decade ago
remove the brackets:
9x^8+4x^7+7x^6-2-7x^8-3x^7-7x^6+2 (notice how the signs were reversed in the second polynomial when the brackets were removed this is becasue effectively we've multiplied everything in brackets by -1).
Combine like terms
9x^8-7x^8 +4x^7-3x^7 + 7x^6-7x^6 -2+2
= 2x^8 + x^7 (all other terms cancel each other out)
It's up to you if you want to leave it like that or give into the very strong temptation to factorise it.
sorry can't resist the .... temptation!
x^7(2x+1)
- Anonymous1 decade ago
Let's split it off into like terms.
(9x^8 - 7x^8) + (4x^7 - 3x^7) + (7x^6 - 7x^6) + (-2 - - 2)
= 2x^8 + x^7 + 2 - 2
= 2x^8 + x^7
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