Answer:
5x² - 5x + 2
Step-by-step explanation:
given
(3x² - 4x + 7 ) - (- 2x² + x + 5 )
distribute both parenthesis, noting that the second one is distributed by - 1
= 3x² - 4x + 7 + 2x² - x - 5 ← collect like rerms
= (3x² + 2x² ) + (- 4x - x ) + (7 - 5 )
= 5x² + (- 5x ) + 2
= 5x² - 5x + 2
