how to solve attached

Question

http://assets.openstudy.com/updates/attachments/54e7c765e4b08080d2e478e8-nickymail48-1424476031871-13.png

Answer 1

(5x² + 5) - (3x² + 1) + (x² + 2x)

 

= 5x² + 5 - 3x² - 1 + x² + 2x

 

Rearranging to collect like-terms:

 

= (5x² - 3x² + x²) + 2x + (5 - 1)

 

= 3x² + 2x + 4