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

If this was not what you had in mind,please post complete and clear question in a seperate thread for rapid assisstance from our experts.
Regards!
 

  • 0
Into
  • 0
What are you looking for?