Chapter 9 Algebra Worksheet With Answers - Montville Township Public Schools Page 7
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31The maximum value is 16.
The rocket will be in the air for a total of 2 seconds. It will go from the ground to a maximum height of 16 feet,
c.
and then it will return to the ground. Therefore, a reasonable domain for this situation is D = {t | 0 ≤ t ≤ 2} and a
Study Guide and Review - Chapter 9
reasonable range is R = {h | 0 ≤ h ≤ 16}.
Solve each equation by graphing. If integral roots cannot be found, estimate the roots to the nearest
tenth.
2
16. x
− 3x − 4 = 0
SOLUTION:
2
Graph the related function f (x) = x
− 3x − 4.
The x-intercepts of the graph appear to be at –1 and 4, so the solutions are –1 and 4.
CHECK: Check each solution in the original equation.
Therefore, the solutions are
1 and 4.
–
2
17. −x
+ 6x − 9 = 0
SOLUTION:
2
Graph the related function f (x) = −x
+ 6x − 9.
The x-intercept of the graph appears to be only at 3, so the only solution is 3.
CHECK: Check the solution in the original equation.
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