Solving Quadratic Equations by Graphs, Tables, and Factoring

Use the graph of the function f(x)=-2x²+4x+6 to find the solution(s) of the equation -2x²+4x+6=0.

• x=-1

• x=3

• x=-1 and x=3

• x=1and x=8 

Use the graph of y=-x²+6x-5 to solve the equation -x²+6x-5=0

• (1,5)

• {3,4}

• {1,5}

• {2,4}

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

• -1 and 3
• 1 and -3
• -1 and -3
• 1 and 3

• A

• B

• C

• D

Solve by factoring

• -4, 2

• -2, 4

• -16

• -4

• A

• B

• C

• D

• A

• B

• C

• D

If each mark on the x-axis represents one second, when did the object reach the ground?

• 2.5 seconds

• 6 seconds

• 5.5 seconds

• 5 seconds

• A

• B

• C

• D