1.
Solve
x
2
- 6
x
+ 25 = 0.
A.
-3 ± 4
i
B.
6 ± 8
i
C.
D.
3 ± 4
i
Hint
2.
Solve 2
x
2
- 4
x
+ 3 = 0.
A.
B.
C.
D.
Hint
3.
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.
4.8 s
B.
0.1 s
C.
-0.1 s
D.
3.2 s
Hint
4.
Solve
x
2
+ 14
x
+ 49 = 0 by using the quadratic formula.
A.
3, 8
B.
6, 16
C.
–3, –8
D.
7, –18
Hint
5.
Solve
x
2
+ 14
x
+ 49 = 0 by using the quadratic formula.
A.
–6, –8
B.
6, 8
C.
–7
D.
7
Hint