For Exercise:
(a) Use a graph to estimate the solution set for the inequality. Zoom in far enough so that you can estimate the relevant end points to the nearest thousandth.
(b) Exercise can be solved algebraically using the techniques presented in this section. Carry out the algebra to obtain exact expressions for the endpoints that you estimated in part (a). Then use a calculator to check that your results are consistent with the previous estimates.
x4 − 2x2 + 1 > 0
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