Simplify i)(√7-√3)² ii)(5-√11) (5+√11)
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i)(√7-√3)²
=> (√7)²+(√3)²-2(√7)(√3)
=> 7+3-2√21
=> 10-2√21
ii)(5-√11) (5+√11)
=> (5)²-(√11)²
=> 25-11
=> 14
Remember:
(a-b)²= a²+b²-2ab
a²-b²=(a+b)(a-b)
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