Consider the equation 9 – 4x = 2x.

Which equation resulted from adding 4x to both sides to isolate the variable term?

9 – 2x = 4x
9 = –2x
9 = 6x
4x= 2x – 9

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.