Solving Quadratics and Complex Numbers

What are the solutions to the quadratic equation?

• x = -4

• x = 1

• x = -1

• x = 2

• x = 4

To calculate the TIME that a maximum height occurs, you should use: 

• -b/(2a) 

• Quadratic formula 

• the c value 

• 0

For that same projectile, at what TIME does the maximum height occur? 
h(t) = -16t² + 20t + 6 

• 0 seconds 

• 625 seconds 

• 160 seconds 

• 2 seconds 

To find out when an object hits the ground, after we put in 0 for h, we can use this to calculate the time it hits the ground: 

• -b/(2a) 

• Quadratic Formula 

• Pythagorean Theorem

• Just square root everything 

The function f(t) = -5t²+20t + 60 models the approximate height of an object t seconds after it is launched. How many seconds does it take the object to hit the ground?

• 4 seconds

• -2 seconds

• 6 seconds

• 9 seconds

If path of a projectile is modeled by: 
h(t) = -16t² + 20t +6, what is the height after 1 second? 

• 6 feet 

• 20 feet 

• 10 feet 

• 4 feet 

What is this formula?

• Pythagorean Theorem

• Quadratic formula.

• Slope Formula

• Function Formula

Solve by Quadratic Equation

4x²-7x+5=0

• (7 ± i √31 ) / 8

• (-1 ± i √55 ) / 8

• (7 ± √31) / 4

• (1 ± i √57) / 8

• A
• B
• C
• D

Solve
x² + 49 = 0

• -7

• -7

• 7i

• ±7i