How do you factor $4 - 25x^2$ ?

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Answer 1 · 2015-04-09T17:38:09

In the the general form
$(a^2 - b^2) = (a-b)*(a+b)$

This form fits the given expression $(4-25x^2)$
with $a^2=2^2$ and $b^2=(5x)^2$

so $(4-25x^2)$ can be factored as
$(2-5x)(2+5x)$

How do you factor 4 - 25x^24 - 25x^2?