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Cerrena [4.2K]
3 years ago
5

A) Write down and simplify the expansion of (a + b/a)^6

Mathematics
1 answer:
Jlenok [28]3 years ago
4 0

Answer:

a) a^6+6a^4b+15a^2b^2+20b^3+15(b^4/a^2)+6(b^5/a^4)+(b/a)^6

b) 20

c) a^6+6a^4+15a^2+20+15/a^2+6/a^4+1/a^6

Step-by-step explanation:

(a+b/a)^6=a^6+6a^5(b/a)+15a^4(b/a)^2+20a^3(b/a)^3+15a^2(b/a)^4+6a(b/a)^5+(b/a)^6

a^6+6a^4b+15a^2b^2+20b^3+15(b^4/a^2)+6(b^5/a^4)+(b/a)^6

b) the coefficient of b^3=20

c) if b=1, the expression is

a^6+6a^4+15a^2+20+15/a^2+6/a^4+1/a^6

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