How do I use a sign chart to solve #x^2+1<0#? Precalculus Solving Rational Inequalities Sign Charts 1 Answer Wataru Oct 2, 2014 Since #x^2+1 ge 1#, there is no solution for #x^2+1<0#. Answer link Related questions What is an inequality? What is a sign chart? How do I use a sign chart to solve #x^2>4#? How do I use a sign chart to solve #2x^2-7x<=-3#? How do I use a sign chart to solve #x^2<4#? How do I use a sign chart to solve #4x^2<=28x#? How do I use a sign chart to solve #2x^2-7x> -3#? How do I use a sign chart to solve #x^2+5x-9<0#? How do I use a sign chart to solve #2< -16t^2+6<5#? How do I use a sign chart to solve #2x^2+5x-3>0#? See all questions in Sign Charts Impact of this question 3500 views around the world You can reuse this answer Creative Commons License