9. If a - b = 4 and a + b = 6; find :
(i) a2 + b2
(ii) ab
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Answer:
a-b=4
a+b=6
2a=10
a=5
b=1
(ii)ab=5×1=5
(i)a2+b2=(a+b)^2-2ab
6^2-2×5
36-10
:26
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