Engineering Board Exam Reviewer · Exponents, Radicals, and Exponential Equations · medium

Rationalize the denominator: 3/ 5- 2.

1. 5- 2
2. 5+ 2
3. 3≤ft( 5+ 2 )
4. 5+ 2/3

Answer

B. 5+ 2

Solution

Multiply by the conjugate: 3( 5+ 2)/( 5)2-( 2)2=3( 5+ 2)/3= 5+ 2.

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