Question

how a square + b square = (a+b) -2ab


Means




how Alpha square plus beta square is equal to hold alpha + bita square minus 2 a b ​

Answer 1

check the attached pic..

hope this helped you....

Answer 2

(a+b)^2=(a+b)(a+b)

=a(a+b)+b(a+b)

=a^2+ab+b^2+ab

=a^2+b^2+2ab

Hence Proved