Question

What is the exact value of the expression √72 - √8 + √128? Simplify if possible.

8√2
12√2
8√3
12√3

Answer 1

√72 can be written as 3√8 , √128 as 4√8.. Here, we have to solve √72 -√8 +√128 .. i.e, 3√8 - √8 + 4√8.. which is equal to 6√8 or can be written as 12√2 //