please tell me question number 3 and 4
Attachments:
Answers
Answered by
0
3.
=153²-147²
(a+b)(a-b)
=(153+147)(153-147)
=300×6
=1800
4.
=12.1²-7.9²
(a+b)(a-b)
=(12.1+7.9)(12.1-7.9)
=20×4.2
=84
Similar questions