(√(7-4√3) +√(7+4√3) )² = √(7-4√3²) +√(7+4√3)² + 2√((7-4√3) *(7+4√3)) =
= 7- 4√3+ 7+ 4√3 + 2√(49- 48)= 14+2 =16
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(√(7-4√3) +√(7+4√3) )² = √(7-4√3²) +√(7+4√3)² + 2√((7-4√3) *(7+4√3)) =
= 7- 4√3+ 7+ 4√3 + 2√(49- 48)= 14+2 =16