Question

D is the wrong answer please help :(

Answer 1

`\displaystyle T_r=\binom{n}{r-1}x^(n-r+1)y^(r-1)\\\\\\T_7=\binom{11}{6}(-3x)^(11-7+1)(-2y)^(7-1)\\\\T_7=(11!)/(6!5!)(-3x)^5(-2y)^6\\\\T_7=(7\cdot8\cdot9\cdot10\cdot11)/(2\cdot3\cdot4\cdot5)(-3x)^5(-2y)^6\\\\T_7=462(-3x)^5(-2y)^6`

Answer 2

This can be solved by Newton's binomial formula

Tk+1 = (n k) a∧(n-k) b∧k k+1=7 => k=6, n=11 , a=-3x and b=-2y

T7= (11 6) (-3x)∧(11-6) (-2y)∧6 = (11*10*9*8*7)/(1*2*3*4*5) (-3x)∧5 (-2y)∧6

T7= 462 (-3x)∧5 (-2y)∧6

The correct answer is A.

Good luck!!!