Answer:
25x^2 - 49 = (5x-7)(5x+7)
Explanation:
Given the expression is 25x^2 - 49.
We can compare the given problem with "Difference of square formula" i.e. a^2 - b^2 = (a-b)(a+b).
We have 25x^2 - 49.
25x^2 - 49 = (5x)^2 - (7)^2
25x^2 - 49 = (5x-7)(5x+7)
Hence, the factored form is 25x^2 - 49 = (5x-7)(5x+7).