1.

(√6 + 1)² = ? + 2√6

Answer»

7



? = (√6 + 1)² - 2√6
= (√6)² + 2 X √6 + 1 + 1² - 2√6
= 6 + 2√6 + 1 - 2√6 = 6 + 1 = 7



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