Solving Quadratics from a Graph

How many zeros does this parabola have? 

• 3

• 2

• 0

• 1

Tags

CCSS.HSF-IF.C.7A

The graph of a Quadratic Equation is called a(n)....

• Circle

• Elipse

• Parabola

• Line

Tags

CCSS.HSF-IF.C.7A

Given a graph, how can you find the "solutions" to a quadratic?

• Copy off neighbor

• Plug into calculator

• Solutions are where the quadratic crosses the x axis

• Magic 8 Ball

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 to determine the solutions.

• -1 and -3

• 1 and -3

• 1 and 3

• -1 and 3

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

Solve the equation by graphing.
 -x² + 12x - 36 = 0

• 6

• 3

• 4

• no solution

Answer explanation

The quadratic equation can be factored as (x-3)(x-3) = 0, which simplifies to (x-3)^2 = 0. Therefore, x = 3 is the only solution.

Use the graph to determine the solutions.

• -1 and -3

• 1 and -3

• 1 and 3

• -1 and 3

• (-3,0) and (6,0)

• (-1.5,0) and (2,0)

• (-3,0) and (3,0)

• (-.5,0) and (6,0)