Question

Verify that a+b=b+a by taking
1.a=-7/5,b=2/7

Answer 1

-7/5+ 2/7= 2/7+(-7/5)
:- (-49+10)/35=(10-49)/35
:- -39/35=-39/35

Answer 2

Hi friend,

a=-7/5
b=2/7
a+b=b+a
Take LHS,
a+b=-7/5+2/7
=-7/5×7/7+2/7×5/5
=-49/35+10/35
=-49+10/35
=-39/35
Take RHS,
b+a=2/7+(-7/5)
=2/7-7/5
=2/7×5/5-7/5×7/7
=10/35-49/35
=10-49/35
=-39/35
LHS=RHS
a+b=b+a

Hence proved