Question

$25a^2-4$ can be factorized as:

• A. (5a + 2) (5a + 2)
• B. (5a - 2) (5a - 2)
• C. (5a + 2) (5a - 2)
• D. (5a + 12) (5a - 12)

Answer 1

The correct option is C

(5a + 2) (5a - 2)

$25a^2-4$ is in the form of $a^2-b^2$
So, the identity $a^2-b^2$ =$(a-b)(a+b)$ can be used.
$25a^2-4$ = $(5a{)}^2-2^2$ = $(5a+2)(5a-2)$