Page 64 - Math Course 3 (Book 1)

The Quadratic Formula

Your Turn!

Use the Quadratic Formula to Solve a Problem

SPACE TRAVEL
The gravitational acceleration on Venus is about
8.9 meters per second squared, and on Callisto,
one of Jupiter’s moons, it is 1.2 meters per second
squared. Suppose a baseball is thrown on Callisto
with an upward velocity of 10 meters per second
from two meters above the ground.

Find how much longer the ball will stay in air than a
similarly-thrown ball on Venus. Use the equation
1
2
H = – gt + vt + h where H is the height of an

2
object t seconds after it is thrown upward, v is the
initial velocity, g is the gravitational pull, and h is the
initial height.
A. about 10 seconds
B. about 25.2 seconds
C. about 12.5 seconds
D. about 14.5 seconds

Answer

Use the Discriminant

State the value of the discriminant for the equation State the value of the discriminant for the equation
x + 2x + 2 = 0. Then determine the number of real –5x + 10x = –1. Then determine the number of real
2
2
roots for the equation. roots for the equation.
A. –4; no real roots A. –120; no real roots
B. 4; 2 real roots B. 120; 2 real roots
C. 0; 1 real root C. 0; 1 real root
D. cannot be determined D. cannot be determined

Answer Answer

56