Question

add
x² -2x²y + 3xy² - y³, 2y³ -3y²x +9x²y and -3x² +3x²y -9y³

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Answer 1

$\sf x^2 - 2x^2y + 3xy^2 - y^3 + 2y^3 - 3y^2x + 9x^2y - 3x^2 + 3x^2y - 9y^3$

$\sf = (x^2 - 3x^2) + (-y^3+2y^3-9y^3) + (3xy^2-3xy^2) + (9x^2y + 3x^2y - 2x^2y)$

$\sf = -2x^2 - 8y^3 + 0 + 10x^2y$

$\sf = 10x^2y - 2x^2 - 6y^3$

Answer 2

Answer:

this is formula

Step-by-step explanation:

$x {}^{2} - 2 {x}^{2} + 3xy {}^{2} - {y}^{3} + (2 {y}^{3}- 3 {y}^{2} x + 9x {}^{2} y)$

$x{}^{2} −2x {}^{2} +3xy {}^{2} −y {}^{3} + 2y {}^{2} −3y {}^{2} x+9x {}^{2} y$

use this step and it will br solve then when the ans will come add it with another line wich is after and in question.