SOLUTION: Please help me add the following: (12a3 - 9a2 + 8) + (6a3 + 4a2 -a)

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Please help me add the following: (12a3 - 9a2 + 8) + (6a3 + 4a2 -a)      Log On


   

Question 260738: Please help me add the following:
(12a3 - 9a2 + 8) + (6a3 + 4a2 -a)
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
%2812a%5E3+-+9a%5E2+%2B+8%29+%2B+%286a%5E3+%2B+4a%5E2+-a%29 Start with the given expression


12a%5E3+-+9a%5E2+%2B+8+%2B+6a%5E3+%2B+4a%5E2+-a Remove the parenthesis


%2812a%5E3%2B+6a%5E3%29%2B%28+-+9a%5E2%2B+4a%5E2%29-a+%2B+8 Group like terms.


18a%5E3-5a%5E2-a+%2B+8 Combine like terms.


So %2812a%5E3+-+9a%5E2+%2B+8%29+%2B+%286a%5E3+%2B+4a%5E2+-a%29=18a%5E3-5a%5E2-a+%2B+8