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Question

Simplify by rationalizing the denominator 23222+33

A
207619
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B
227619
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C
217619
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D
22769
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Solution

The correct option is B: 227619
23222+33

the conjugate of 22+33 is 2233

=(232)(22+33)× (2233)(2233)

=(23×22)+(23×33)+(2×22)+(2×33)(22)2(33)2 [(a+b)(ab)=a2b2]

=466924+36827 [4=2,9=3]

=46184+3619

=762219

=227619


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