CPM Homework Help : CCA2 Problem 10-128

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10-128.

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

Hint:

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

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

$f(x) = 2x^2 - 3x - 9$
Answer (b):
$x = -1.5, 3$

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

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

$f(x) = 3x^3 + 2x^2 - 8x$
Hint (e):
Each term has an $x$ .
Answer (e):
$x=0,-2,\frac{4}{3}$

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

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