Question

1. Which of the following is not a radical expression that is equivalent to √1087A.√2-√54B.√3-√36C.√5-√21D. √6-√18

Answer 1

Given the expression below

`√(108)`

To find the equivalence of the given expression, we will multiply the radicals to find the odd one out

`\begin{gathered} √(2)*√(54)=√(108) \\ √(3)*√(36)=√(108) \\ √(5)*√(2)=√(105) \\ √(6)*√(18)=√(108) \end{gathered}`

From the deductions above,

Hence, the radical expression that is not equivalent to the given expression is

`√(5)*√(21)`

The answer is option C