If a+b=5 and a-b=6 then find the value of a2+b2
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a+b=5. a-b=6
a=5-b
substitute a=5-b in a-b=6
a-b=6
5-b-b=6
5-2b=6
5-6=2b
-1=2b
b=-1/2
a+b=5
a-1/2=5
a=5+1/2
a=11/2
then a2+b2=
=11/2×2+(-1/2×2)
11+(-1)
10is the answer
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