15.Solve : (2 √2 + 7 √7) + (13 √2 – 4√ 7)
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=(2 √2 + 7 √7) + (13 √2 – 4√ 7)
=2 √2 + 7 √7+ 13 √2 – 4√ 7
= 2 √2 + 13 √2 + 7 √7– 4√ 7
=15√2+3√7.
.........ans.....,.
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