√7*√7+2*4√2*√7+4√2*4√2=7+8√14+32= 39+8√14
(√7+4√2)² = 7 + 2*√7*4√2 + 32 = 39 + 8√7*2 = 39 + 8√14
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√7*√7+2*4√2*√7+4√2*4√2=7+8√14+32= 39+8√14
(√7+4√2)² = 7 + 2*√7*4√2 + 32 = 39 + 8√7*2 = 39 + 8√14