Question 937590

Express as entire radicals in simplest form;

a) 4 square root 7     answer is square root 112

b) -6 square root 3    answer is - square root 108

I am  not sure how they got those answers

Thanks
 
a)<pre>
{{{4sqrt(7)}}}____{{{sqrt(4^2 * 7)}}}_____{{{sqrt(16 * 7)}}}_____{{{highlight_green(sqrt(112))}}}
</pre>
b)<pre>
{{{- 6sqrt(3)}}}____{{{- sqrt(6^2 * 3)}}}_____{{{- sqrt(36 * 3)}}}_____{{{highlight_green(- sqrt(108))}}}
</pre>