Solve Quadratics by Graphing Practice

To solve a quadratic by graphing is to find where the parabola crosses the x-axis. We call these the ___. Select all that apply.

• zeroes

• x-intercepts

• solutions

• roots

Find the roots

• x = -1 x = 3

• x = -2 x = 3

• x = -1 x = 4

Solve by graphing.

0 = 10 x² + 10x - 200

• 4 and -5

• 6 and 5

• 4 and 1

• -7

Solve by graphing.

2x² + 17x + 21 = 0

• x= ^-21/₂, -17

• x= ²/₃, 16

• x=-7, ^-3/₂

• x=15, -³/₇

Solve by graphing. 3x² + 4x – 20 = 0?

• 0 and -20

• 3.33 and -2

• -3.33 and 2

• -0.67 and -21.33

Solve by graphing.

3 = 2x² - x

• 1 and 1.5

• -1 and 1.5

• -1 and -1.5

• 1 and -1.5

Solve by graphing. 

8 = x² - 7x

• 1 and 4

• -1 and 5

• -1 and 8

• 1 and -7

Which graph has a discriminant = 0?

• None of them

• Red

• Blue

• Green

Which of the following is not a method we have used to solve quadratics?

• Factoring

• Quadratic Formula

• Simplifying

• Taking the Square Root

• Graphing