a2+b2=30 ab=30 and a+b=?
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(a+b)^2=a^2+b^2+2ab
(a+b)^2=30+2×30
(a+b)^2=90
(a+b)=root90
a+b=3 root 10
(a+b)^2=30+2×30
(a+b)^2=90
(a+b)=root90
a+b=3 root 10
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