Question

Numbers are -3 square root 15 ( square root 5+2)

Answer 1

Solution

Solve the surds form below

$-3\sqrt{15}(\sqrt{5}+2)$

Step 1:

$\begin{gathered} -3\sqrt{15}(\sqrt{5}+2) \\ Applying\text{ distributive rule} \\ -3\sqrt{15}.\sqrt{5}-3\sqrt{15}(2) \end{gathered}$

Step 2 :

Simplify

$\begin{gathered} -3\sqrt{75}-6\sqrt{15} \\ -3(5)\sqrt{3}-6\sqrt{15} \\ -15\sqrt{3}-6\sqrt{15} \end{gathered}$

Hence the final answer is

$-(15\sqrt{3}+6\sqrt{15})$