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4-94.

Solve each of the following inequalities. Express the solutions algebraically and on a number line.  

  1. Plot the boundary point. Should it be shaded or not? Test values on either side of . Which side makes it true?

    Shaded on number line, from opened circle on 13, to the left.

  1. See part (a). Rearrange the equation so that it equals zero.

    The equation can't be factored. Use the Quadratic Formula.

    Plot the boundary points. Test a point between them. Does it make the inequality true? If so, shade between.
    If not, test points on the outside.

    or

    Shaded on number line, from closed circle, between negative 1 & 0, to classed circle, between 3 & 4.