(2root11-7)(2root11-7)
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Answer:
93 - 28√11
Step-by-step explanation:
(2√11 - 7)(2√11 - 7)
= (2√11 - 7)²
Use (a - b)² = a² + b² - 2ab
= (2√11)² + (7)² - 2(2√11)(7)
= 4(11) + 49 - 14(2√11)
= 44 + 49 - 28√11
= 93 - 28√11
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