Suppose that the functions f and g are defined for all real numbers x as follows.
f(x) = x - 4
g(x) = 3x +1
Write the expressions for (f•g)(x) and (f+g)(x) and evaluate (f-g)(-1)

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.