regmat.com/quizzes/quiz/timed-quant-practice-medium-section-2-sample-test-3
in question 8, if i convert the parabola question into y=a(x-h)+ k, where (h,k) is vertex then the vertex turns out to be (b/2,8). Then b can take all vales mentioned in the question and it will still not touch x axis, if I draw a graph…
What’s wrong with this understanding?