Evaluate 75?65 by using identities

Dear Student,
I am assuming that the question is "75 x 65"

75=(70+5)65=(70-5)So,75×65=(70+5)×(70-5)Since, (a-b)(a+b)=a2-b2(70+5)(70-5)=702-52=4900-25=4875

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