(√7 + 3)² = (√7)² + 2•3• (√7) + 3² =
= 7 + 6•(√7)² + 9 = 16 + 6•√7 =
= 2(8 + 3•√7)
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(√7 + 3)² = (√7)² + 2•3• (√7) + 3² =
= 7 + 6•(√7)² + 9 = 16 + 6•√7 =
= 2(8 + 3•√7)