Close Contents Introduction Podcast Beta Questions and Answers More Actions PDF Questions Make a copy Study Flashcards Play Quiz Podcast Beta Play an AI-generated podcast conversation about this lesson 0.7x 0.9x 1x 1.1x 1.3x 1.5x 1.7x 2x Questions and Answers Download PDF PDF Questions PDF Answers Which of the following is a quadratic equation? 2x+1=0 2x3+3x2-4x+1=0 (correct) X(x+1)=0 (x+1)(x-2)=(x+3)(x-1)