1.
Solve
x
2
+ 7
x
+ 8 = 0.
A.
B.
C.
D.
Hint
2.
Suppose a ball is thrown straight up at a speed of 50 feet per second. The time in seconds that it takes for the ball to hit the ground can be found by solving the equation 5 + 50
t
- 16
t
2
= 0. Approximately how long does it take for the ball to hit the ground?
A.
-0.1 s
B.
4.8 s
C.
0.1 s
D.
3.2 s
Hint
3.
Use the quadratic formula to solve 6
x
2
-
x
- 1 = 0.
A.
B.
C.
D.
Hint
4.
Solve
x
2
+ 14
x
+ 49 = 0 by using the quadratic formula.
A.
–7
B.
7
C.
6, 8
D.
–6, –8
Hint
5.
Solve
by using the quadratic formula.
A.
B.
C.
D.
Hint