Question

this is the expansion chapter. please give the correct answer. plz......fasttttt.......​

Answer 1

Step-by-step explanation:

formula:

(a-b) ^2-((a+b)(a-b))

(a^2-2ab+b^2)-(a^2-2b^2)

a^2-2ab+b^2-a^2+b^2

-2ab+b^4

now keep values of a and b

-2(3x)(1/3x)+(1/3x)^4

-2+(1/3x)4

-2+(1/81x^4)

-2-81x^4

^ is symbol of power