Mathematics: Perform the operation indicated, then place the answer in the proper location on the grid. write your answer in descending powers of m. (5m 3 + 3mn 2) + (-7m 2n + mn 2 - n 3) - (mn 2 + 2m 3)

Perform the operation indicated, then place the

bburpee1

12.01.2022

The given expression in descending powers of m is

${\bf 3m^3+3m^2n-7m^2n-n^3}$

Step-by-step explanation:

The given expression is (5m^3+3mn^2)+(-7m^2n+mn^2-n^3)-(mn^2+2m^3)

Now solve the above expression

(5m^3+3mn^2)+(-7m^2n+mn^2-n^3)-(mn^2+2m^3)=5m^3+3mn^2-7m^2n+mn^2-n^3-mn^2-2m^3

(5m^3+3mn^2)+(-7m^2n+mn^2-n^3)-(mn^2+2m^3) = 3m^3+3m^2n-7m^2n-n^3 (where mn^2 and -mn^2 getting cancelled because of alternate signs)

Therefore the above expression in descending powers of m is

3m^3+3m^2n-7m^2n-n^3

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