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Home > AC > Chapter 9 > Lesson 9.1.1 > Problem 9-13

9-13.

For each parabola graphed below, visually estimate the -intercepts. Then use the Quadratic Formula to confirm your estimates.

  1. An upward parabola with vertex in fourth quadrant, The parabola crosses the x axis between 0 and 1 and between 4 and 5.

     or 

  1. An upward parabola with vertex in third quadrant, The parabola crosses the x axis between negative 4 and negative 3 and between 1 and 2.

    See part (a).