Factorise a2 - 4b2 ____is.

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4 + 1 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

Factorise a2 - 4b2 ____is:

(a2 -2b2)(a2 +2b2)

(a -b)(a + b)(a2 + 4b2)

(a - b)(a + b)(a2-4b2)

(a-2b)(a2 + 2b2)