Step: Find the mean proportional
6+3√3 and 8−4√3
Let mean proportional be x
∴6+3√3,x and 8−4√3 are in proportional
⇒6+3√3x=x8−4√3
⇒x×x=(6+3√3)(8−4√3)
⇒x2=48−24√3+24√3−12(√3)2
⇒x2=48−12×3
⇒x2=48−36
⇒x2=12
⇒x=√12
∴x=2√3
Hence, the mean proportional is 2√3