(√4+√7+√4-√7)²=√(4+√7)² + 2√(4+√7) * √(4-√7)²=
4+√7+2√(4+√7)(4-√7) +4-√7=
8+2√(4²-√7²)=8+2√(16-7) = 8+2√9=8+2*3=8+6=14.
Ответ: 14.
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(√4+√7+√4-√7)²=√(4+√7)² + 2√(4+√7) * √(4-√7)²=
4+√7+2√(4+√7)(4-√7) +4-√7=
8+2√(4²-√7²)=8+2√(16-7) = 8+2√9=8+2*3=8+6=14.
Ответ: 14.