A line has equation y = 3kx - 2k and a curve has equation y = r - kx + 2. where k is a constant. Find the set of values of k for which the line and curve meet at two distinct points.

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.