9(9r + 3s - 9)
Evaluate this

81r +27s-81

Explanation:
9×9 = 81 r
9×3 = 27 s
9x-9 = -81

Horizontal change or the change of x

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.