Question 659873
<pre>
-12x² - 2x + k = 0

There is a repeated real solution if the discriminant, what's under the
radical in the quadratic formula, b² - 4ac = 0

a = -12, b = -2, c = k

b² - 4ac = 0

(-2)² - 4(-12)(k) = 0
          4 + 48k = 0
              48k = -4
                k = {{{-4/48}}}
                k = {{{-1/12}}}

Edwin</pre>