# The expression a^4 - b^4 / a^3b + b^3a is equivalent to: 1) a/b + b/a 2)

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## Question:

The expression a^4 - b^4 / a^3b + b^3a is equivalent to:

1) a/b + b/a

2) a-b / a+b

3) (1 - b/a) (1 + a/b)

4) (a^2 + b^2) / ab

5) a^3 - b^3 / a^3 + b^3