Answer:
2x³ + 3x² +x - 4xy + 5y
Explanation:
To add the expressions, combine the like terms. Like terms have the same variable with the same power.
3x² - 6x + xy + 2x³ - 5xy - 3y + 7x + 8y
In this, the like terms are:
(i) (-6x) & 7x
(ii) xy & (-5xy)
(iii) (-3y) and 8y
Combine (add/subtract) the co-efficient of the like terms.
3x² - 6x + xy + 2x³ - 5xy - 3y + 7x + 8y
= 2x³ + 3x² - 6x + 7x + xy - 5xy - 3y + 8y
= 2x³ + 3x² +x - 4xy + 5y
Answer: 2x³ + 3x² +x - 4xy + 5y