How do you factor the expression $25 x^{2} - 4$ $25x^2 - 4$ ?

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Answer 1 · 2016-01-31T11:38:10

$(5 x + 2) (5 x - 2) or (5 x - 2) (5 x + 2)$ $(5x + 2)(5x - 2) or (5x - 2)(5x + 2)$
Both are correct answers :)

Since $a^{2} - b^{2} = (a + b) (a - b) or (a + b) (a - b)$ $a^2 - b^2 = (a + b)(a - b) or (a + b)(a - b)$
(Factoring Difference of Two Squares)

We can do this by "Trial and Error Method".

$25 x^{2} - 4$ $25x^2 - 4$

giving $(5 x + 2) (5 x - 2)$ $(5x + 2)(5x - 2)$
or $(5 x - 2) (5 x + 2)$ $(5x - 2)(5x + 2)$

How do you factor the expression 25x^2 - 425x2−425x^2 - 4?