Question

Verify theta+b=b+a a=3/4 b=-2/5

Answer 1

a=3/4
b=-2/5

LHS=a+b
=3/4+(-2/5)
=3/4-2/5
=3/4×5/5-2/5×4/4
=15/20-8/20
=(15-8)/20
=7/20

RHS=b+a
=-2/5+3/4
=-2/5×4/4+3/4×5/5
=-8/20+15/20
=(-8+15)/20
=7/20

LHS=RHS
a+b=b+a

Hence proved

Answer 2

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