1.

Expand the following (a-7c/3)^4

Answer»

SOLUTION :`(a-(7c)/3)^4` = `a^4 + "^4C_1 a^(4-1) ((-7c)/3)^1 + ^4C_2 a^(4-2) ((-7c)/3)^2 + ... +((-7c)/3)^4`
= `a^4-4a^3xx(7c)/3 + 6a^2xx49c^2/9 + ... + (7^4c^4)/81`
= a^4- 28/3a^3c + 98/3a^2c^2+ ... +(7^4c^4)/81`


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