Factor p^2-4q^2

Math
p2-4q2
Rewrite 4q2 as (2q)2.
p2-(2q)2
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=p and b=2q.
(p+2q)(p-(2q))
Multiply 2 by -1.
(p+2q)(p-2q)
Factor p^2-4q^2

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