[tex] \boxed{\underline{\large{\mathbb{ANSWERS:}}}}[/tex]
Apply Difference of Two Squares Formula:
[tex](a - b)(a + b) = a^{2} - b^{2} (5a - b)(5a + b) = \: (5a)^{2} - b^{2} [/tex]
Simplify : [tex](5a)^{2} : \: \: 25a^{2} [/tex]
So the answer will be:
[tex]25a^{2} - b^{2} [/tex]
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