C because that sign means lesser than or equal to 6
Answer:
Step-by-step explanation:
Answer:
1350
Step-by-step explanation:
use binomial general term expression for (r+1)th term
get the power of x in terms of r.
equate the expression to -2 and solve for r.
replace value of r and calculate the coefficient.
its step 2 he did not subtract it right hope this helps and have a great day and get some sleep lol