Question

Please help
it would mean the
absolute world:/ giving away lots of points:/

Answer 1

:)

Explanation:

`M = 3x^2y^3-4xy +x^3y\\\\2M = 2 * (3x^2y^3-4xy +x^3y) \\\\`

`= 6x^2y^3 - 8xy + 2x^3y`

`N = -2x^3y + 6x^2y^3 -8xy -8`

`= 6x^2y^3 -8xy -2x^3y -8`
`[ re-arranging \ the \ terms]`

a)

`2 M - N = ( 6x^2y^3 -8xy +2x^3y) - (6x^2y^3-8xy -2x^3y - 8)`

`= 6x^2y^3 - 8xy +2x^3y -6x^2y^3 +8xy +2x^3y + 8\\\\= 4x^3y +8`

b)

`2M - N \ for \ x = -1 \ and \ y = 2: (4(-1)^3* (2)) + 8 = -8 + 8 = 0`