Answer:
A
Step-by-step explanation:
Distribute the parenthesis noting that the second one is distributed by - 1
x² + 14x³ - 6[tex]x^{4}[/tex] - 14x³ - 6[tex]x^{4}[/tex] + 5[tex]x^{5}[/tex]
Collect like terms
= x² - 12[tex]x^{4}[/tex] +5[tex]x^{5}[/tex] → A
