simplify by rationalizing the denominator: 12/√7-√3
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= 12 × √7+√3.
√7-√3 × √7+√3
= 12(√7 + √3)
(√7)² - (√3)²
We apply identity (a+b) (a-b) = a²-b²
= 12(√7 + √3).
7 - 3
= 12(√7 + √3)
4
= 3 (√7 + √3 )
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