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= [(√7×7√7) + (√7×2√8) +(2√8×7√7) +(2√8×2√8)]
= [(7×7) +(2√56) +(14√56) + (4×8)]
= (49 + 2√56 + 14√56 +32)
= (32+49)+(2√56+14√56)-->mengelompokan masing"
= 81+16√56
= 81+16√4×√14
= 81+16×2√14
= 81 + 32√14
semoga membantu :-)