Fault the wrong rationalising factors

Exercise and reference answers

Questions

1. Question

   Three of these will not clear the radical from a denominator of root6 minus root2.

   Choices

   1. Item

      root6 + root2

      Correct

      Yes

   2. Explanation

      squaring the same surd leaves a radical behind

      Item

      root6 - root2

   3. Explanation

      this is the numerator, not the denominator's conjugate

      Item

      5 + root2

   4. Explanation

      a product is not a conjugate and leaves root12

      Item

      root6 x root2

Instructions

Three of these will not rationalise the denominator. Fault each one.