Chapter 8 Worksheet With Answers - Montville Township Public Schools Page 31
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38[-10, 10] scl: 1 by [-10, 90] scl:10
[-10, 10] scl: 1 by [-10, 90] scl:10
Study Guide and Review - Chapter 8
Thus, the solutions are –9 and 9.
2
72. x
− 5 = 20
SOLUTION:
The roots are -5 and 5.
2
Confirm the roots using a graphing calculator. Let Y1 = x
- 5 and Y2 = 20. Use the intersect option from the
CALC menu to find the points of intersection.\
[-10, 10] scl:1 by [-10, 40] scl: 5 [-10, 10] scl:1 by [-10, 40] scl: 5
Thus, the solutions are –5 and 5.
73. EROSION A boulder falls down a mountain into water 64 feet below. The distance d that the boulder falls in t
2
seconds is given by the equation d = 16t
. How long does it take the boulder to hit the water?
SOLUTION:
2
The distance the boulder falls is 64 feet. So, 64 = 16t
.
The roots are –2 and 2. The time cannot be negative. So, it takes 2 seconds for the boulder to hit the water.
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Page 31
Factor each polynomial, if possible. If the polynomial cannot be factored write prime .
2
74. x
+ 12x + 36
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