### Home > CCA2 > Chapter 10 > Lesson 10.2.2 > Problem10-128

10-128.

Without graphing, find where each of the following curves crosses the $x$-axis. (Find the exact points!)

For each equation, let $f(x) = 0$. Then solve by factoring and/or using the Quadratic Formula.

1. $f(x) = x^2 - x - 12$

1. $f(x) = 2x^2 - 3x - 9$

$x = -1.5, 3$

1. $f(x) = 2x^2 + x - 7$

1. $f(x) = 3x^2 - 2x + 7$

1. $f(x) = 3x^3 + 2x^2 - 8x$

Each term has an $x$.

$x=0,-2,\frac{4}{3}$

1. $f(x) = 2x^3 + 2x^2 + 13x$