On simplyfing ( root 5 + root 7 ) power 2 we get.
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(root 5 + root 7)power 2
= (root5)power2 + 2×root5×root7 + (root7)power2
= root5×root5 + 2×root35 + root7×root7
= 5 + 7 + 2×root35
= 12+2×root35
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