(5a-1)(5a+1)-(5a-1)²=(5a)²-1²-(25a²-10a+1)=25a²-1-25a²+10a-1=10a-2
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(5a-1)(5a+1)-(5a-1)²=(5a)²-1²-(25a²-10a+1)=25a²-1-25a²+10a-1=10a-2