Pre Assessment Quadratic Unit Worksheet Page 8
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1320 A rocket is launched from atop a 56-foot cliff with an initial velocity of 135 ft/s.
____
2
Substitute the values into the vertical motion formula h = −16t
+ vt + c. Let h = 0. Use
the quadratic formula find out how long the rocket will take to hit the ground after it is
launched. Round to the nearest tenth of a second.
2
2
A 0 = −16t
+ 135t + 56; 0.4 s
C 0 = −16t
+ 135t + 56; 8.8 s
2
2
B 0 = −16t
+ 56t + 135; 0.4 s
D 0 = −16t
+ 56t + 135; 8.8 s
21 For which discriminant is the graph possible?
____
2
2
2
A b
− 4ac = −9
B b
− 4ac = 0
C b
− 4ac = 4
Find the number of real solutions for the following equations.
2
22 x
− 12x + 36 = 0
____
A 0
B 2
C 1
2
23 x
− 5 = 0
____
A 0
B 2
C 1
Page 8
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