[tex]7 {x}^{2} + 2y - 5{x}^{2} - 8y \\ 8(3 {p }^{3} - 3q) - 3(2 {p}^{3} + 2q) \\ (5x + 2y)(2x - 5y) \\ (10 {p}^{2} q + 2p {q}^{2} ) \div 2pq[/tex] tolong

7x² + 2y - 5x² - 8y
= 2x² - 6y

8(3p³ - 3q ) - 3(2p³ + 2q)
= 24p³ - 24q - 6p³ - 6q
= 18p³ - 30q
= 6(3p³ - 5q)

( 5x + 2y)(2x - 5y)
= 10x² + 4xy - 25xy - 10y²
= 10x² - 21xy - 10y²


10p²q + 2pq²
-------------------
2pq

= 2pq ( 5p + q )
------------------------
2pq

= 5p + q