rad 128 can be broke into 64*2
square root of 64 is 8, times -5,
which leaves -40rad2
To show equality with fractions both fractions should be converted to show their values with the same denominator then draw a picture of those fractions.
Remember that you can only compare fractions with the same denominator as is said with other operations dealing with fractions.
B. is the answer to your question!! Hope this helps!! :D