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Q: the sum of 2x^4 - 4x^3 - 15x^2 + 21x + 4 and 4x^4 + 2x^3 + 17
A: (2x^4 - 4x^3 - 15x^2 + 21x + 4) + (4x^4 + 2x^3 + 17) = 2x^4 - 4x^3 - 15x^2 + 21x + 4 + 4x^4 + 2x^3 + 17 = (2x^4 + 4x^4) + (-4x^3 + 2x^3) - 15x^2 + 21x + (4 + 17) = 6x^4 - 2x^3 - 15x^2 + 21x + 21
Original conversation
User: the sum of 2x^4 - 4x^3 - 15x^2 + 21x + 4 and 4x^4 + 2x^3 + 17

Question
Asked 4/9/2012 8:28:46 PM
Updated 7/16/2014 2:01:06 AM
Flagged by yeswey [7/16/2014 1:58:37 AM]
Rating
3
(2x^4 - 4x^3 - 15x^2 + 21x + 4) + (4x^4 + 2x^3 + 17)
= 2x^4 - 4x^3 - 15x^2 + 21x + 4 + 4x^4 + 2x^3 + 17
= (2x^4 + 4x^4) + (-4x^3 + 2x^3) - 15x^2 + 21x + (4 + 17)
= 6x^4 - 2x^3 - 15x^2 + 21x + 21
Added 7/16/2014 2:01:06 AM
This answer has been confirmed as correct and helpful.
Confirmed by andrewpallarca [7/16/2014 4:18:20 AM]

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