Posted by Aliah on Wednesday, January 18, 2012 at 7:27pm.
find the coefficient of x^5 in the expansion (x+2)(x+1)^8
MATH - Damon, Wednesday, January 18, 2012 at 7:57pm
find coef of x^4 in (x+1)^8
find 2*coef of x^5 in (x+1)^*
MATH - Damon, Wednesday, January 18, 2012 at 8:03pm
from binomial coefficient table
(x+1)^8 = x^8 ..... 56x^5+70x^4....+1
so 70 + 2(56) = 182
MATH - Aliah, Wednesday, January 18, 2012 at 8:33pm
182 is the final answer? Thank you for your help.
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