Chapter 9 Algebra Worksheet With Answers - Montville Township Public Schools Page 9
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31Study Guide and Review - Chapter 9
Therefore, the solution is 3.
2
18. x
− x − 12 = 0
SOLUTION:
2
Graph the related function f (x) = x
− x − 12.
The x-intercepts of the graph appear to be at –3 and 4, so the solutions are –3 and 4.
CHECK: Check each solution in the original equation.
Therefore, the solutions are
3 and 4.
–
2
19. x
+ 4x − 3 = 0
SOLUTION:
2
+ 4x − 3.
Graph the related function f (x) = x
The x-intercepts are located between –5 and –4 and between 0 and 1. Make a table using an increment of 0.1 for
the x-values located between –5 and –4 and between 0 and 1. Look for a change in the signs of the function values.
The function value that is closest to zero is the best approximation for a zero of the function.
x
–4.9
–4.8
–4.7
–4.6
y
1.41
0.84
0.29
–0.24
x
–4.4
–4.3
–4.2
–4.1
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–1.24
–1.71
–2.16
–2.59
y
0.1
0.2
0.3
0.4
x
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