(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-b²】=-25a²+b²=b²-25a²
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