5√3
6√3
8√3
18√3
Correct answer is B
√48 - 9√3 + √75
Rearrange = √48 + √75 - 9√3
= (√16 x √3) + (√25 x √3) - 9√3
=4√3 + 5√3 - 9√3
Rationalize → 9√3 = 9√3 x √3√3
= 9√3√9 - 9√3√3
= 3√3
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