How do you multiply $(x^2 + 2y) (x^2 - 2y)$ ?

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Answer 1 · 2015-03-24T11:03:29

This is a sum multiplied a difference. The rule is:

$(a+b)(a-b)=a^2-b^2$ , so:

$(x^2 + 2y) (x^2 - 2y)=(x^2)^2-(2y)^2=x^4-4y^2$ .

How do you multiply (x^2 + 2y) (x^2 - 2y)(x^2 + 2y) (x^2 - 2y)?