Q6... pls..

Multiply (6√3)(5√3) = 90. 
Are there factors of 90 that add to -47? 
Yes, -45 and -2. 

6√3 x² - 45x - 2x + 5√3 
= 3x(2√3 x - 15) + (-√3/3)(2√3 x - 15) 
= (3x - √3/3)(2√3 x - 15) 
= (1/3)(9x-√3)(2√3x-15) 
You can verify by multiplying it out.