factor 5x4 - 30x2 - 135.
5(x2 + 9)(x2 - 3)
5(x - 3)(x + 3)(x2 - 3)
5(x - 3)(x + 3)(x2 + 3)

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.

Omg that is a big question and weird words and i’m only 5