(5a-b)(-5a-b)

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(5a-b)(-5a-b)(5a-b)(-5a-b)(5a-b)(-5a-b)(5a-b)(-5a-b)=-(5a-b)(5a+b)=-【(5a)²-b²】=-【25a²

(5a-b)(-5a-b)
(5a-b)(-5a-b)

(5a-b)(-5a-b)
(5a-b)(-5a-b) =-(5a-b)(5a+b)=-【(5a)²-b²】=-【25a²-b²】=-25a²+b²=b²-25a²

b²-25a²