Chapter 9 Algebra Worksheet With Answers - Montville Township Public Schools Page 11
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310.6
0.7
0.8
0.9
x
y
–0.24
0.29
0.84
1.41
For each table, the function value that is closest to zero when the sign changes is –0.24. Thus, the solutions are
Study Guide and Review - Chapter 9
approximately –4.6 and 0.6.
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20. x
− 10x = −21
SOLUTION:
Rewrite the equation in standard form.
2
− 10x + 21.
Graph the related function f (x) = x
The x-intercepts of the graph appear to be at 3 and 7, so the solutions are 3 and 7.
CHECK: Check each solution in the original equation.
Therefore, the solutions are 3 and 7.
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21. 6x
− 13x = 15
SOLUTION:
Rewrite the equation in standard form.
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Graph the related function f (x) = 6x
− 13x – 15.
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Page 11
The x-intercepts of the graph appear to be at 3 and between –1 and 0. So, one solution is 3.
CHECK: Check the solution in the original equation.
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