Solve each inequality, showing your working clearly. Use a sign table or number line where appropria

Question

Solve each inequality, showing your working clearly. Use a sign table or number line where appropriate. $x^4-5x^2+4<0$. $x^4-10x^2+9\le0$. $2x^4-7x^2+3\ge0$.

Accepted Answer

(a) $-2<x<-1$ or $1<x<2$ (b) $-3\le x\le-1$ or $1\le x\le3$ (c) $x\le-\sqrt3$, or $-\frac1{\sqrt2}\le x\le\frac1{\sqrt2}$, or $x\ge\sqrt3$

Quadratic Functions, Equations and Inequalities

Quadratic Functions, Equations and Inequalities

Solution:

Solution locked