CPM Homework Help : INT2 Problem 10-20

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Home > INT2 > Chapter 10 > Lesson 10.1.2 > Problem 10-20

10-20.

Solve the equations and inequalities below.

$x^2-2x-3\le0$
Hint (a):
Solve this like an equation and then test points to find the solution region(s).
More Help (a):
The perfect square form is $(x + 1)^2 = 4$ .
Answer (a):
$-1 ≤ x ≤ 3$

$x^2 + 4x = 3$
Answer (b):
$x = -2 \pm \sqrt{7}$

$x^2+5x-36>0$
Hint (c):
Refer to part (a).
More Help (c):
Solve the quadratic by factoring.

$x^2-3x-13.75=0$

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