Answer:
7d²
Step-by-step explanation:
All are like terms. SO combine the like terms
4d² + 9d² - d² - 2d² + 3d² - 6d² = (4 +9 - 1 - 2 + 3 - 6)d²
= ( 4 + 9 + 3 - 1 - 2 -6)d²
= ( 16 - 9)d²
= 7d²
same man
same
my brain is killing me slowly
