You have the following expression:
![14\sqrt[]{6}-6\sqrt[]{24}](https://img.qammunity.org/2023/formulas/mathematics/college/8w8v32etx6hin6smgk9pzf0lc14nnch3oz.png)
In order to simplify the previous expression, conisder that 24 can be written as:
24 = 6*4 = 6*2^2
Then, you have:
![\begin{gathered} 14\sqrt[]{6}-6\sqrt[]{24}= \\ 14\sqrt[]{6}-6\sqrt[]{6\cdot2^2}= \\ 14\sqrt[]{6}-6\cdot2\sqrt[]{6}= \\ 14\sqrt[]{6}-12\sqrt[]{6}= \\ 2\sqrt[]{6} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/5eiebnmdh5dn62w0vre4izqkt9od5e23xf.png)
Where in the last steo you simplify the terms becasue they are like terms due to the factor √6.
Then, you have for the required coefficients:
a = 2
b = 6