Simplify the square root of 18 completely show all work

The square root of eighteen √18 = 4.24264068712 

Simplified Square Root for √18 is 3√2Step by step simplification process to get square roots radical form:First we will find all factors under the square root: 18 has the square factor of 9.Let's check this width √9*2=√18. As you can see the radicals are not in their simplest form.Now extract and take out the square root √9 * √2. Root of √9=3 which results into 3√2All radicals are now simplified. The radicand no longer has any square factors

The correct graph is the second one, with the points being at (-6,0), (2,0) and reaching down to (-2,-8)