1.(x + 1) (3 - x)
2.(5 - x) (X + 8)
find by inspection the efficient of X in the following expansion
Answers
Answered by
3
Answer:
T
r+1
=
8
C
r
x
8−r
3
r
For the coefficient of x
5
8−r=5⇒r=3
∴ Coefficient of x
5
=
8
C
3
.3
3
=
3!5!
8!
×3
3
=
6
8×7×6
×3
3
=8×7×3
3
=56×27
=1512
Step-by-step explanation:
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Answered by
2
1)(x+1) (3-x)
=(Xx3)+(XxX)+(1x3)-(1xX)
=3x+2x3x-x
=9x
2nd is also same as 1st one
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