Question 481964
Hint: If the two solutions are equal, this essentially means you have one solution. Recall that the equation {{{ax^2+bx+c=0}}} has one solution when {{{b^2-4ac=0}}}


So what this means is that because {{{4x^2+4x+k=0}}} has one solution, we know that {{{4^2-4(4)(k)=0}}} (note: {{{a=4}}}, {{{b=4}}}, and {{{c=k}}}). Solve this equation for k to find your answer.