PLEASE ANSWER Which interval contains a local minimum for the graphed function?
A. [-4, -2.5]
B. [-2, -1]
C. [1, 2]
D. [2.5, 4]

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.