Solve x: 3x-5 = 20
and solve x: -3x-5=-20

Solution for 3x-5=20 equation:
3x - 5 = 20
3x = 20 + 5
3x = 25 (divide both sides by 3 to get x)
3x/3 = 25/3
x = 8.33333333333
 

Um what? rephrase that ?

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.