Jeremy is trying to explain why a triangle with side lengths 35, 30, 60 is not a right triangle. his explanation is shown below.

To test whether he given dimensions can form a right angle, we use the Pyhtagorean theorem. This is given by
c^2=a^2+b^2
where:
c=hypotenuse (which is the longest side)
a and b are the legs
thus plugging our values in the expression we shall have:
60^2=35^2+30^2
simplifying this we get:
60^2=3600
35^2+30^2=2125
since
3600≠2125
we conclude that the dimensions cannot form a right triangle

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.