Find Zeros of a Quadratic Expression

What does it mean to "find the zeros" of a quadratic?

• Plug in 0 and solve the expression.

• Factor then set each factor equal to zero and solve to find x-intercepts

• Set the expression equal to zero and solve 

• Factor then set each factor equal to zero and solve to find y-intercepts

Tags

CCSS.HSA-REI.B.4B

Solve for the values of x:

(x - 5)(x - 1) = 0

• (5, 0) or (1, 0)

• (-5, 0) or (-1, 0)

• (0, -5) or (0, -1)

• (0, 5) or (0, 1)

Tags

CCSS.HSA-REI.B.4B

What are the zeros?

2x(x - 5) = 0

• x = 0, 5

• x = 0, - 5

• x = 5

• x = -5

Tags

CCSS.HSF-IF.C.7C

What is another way to say "where a function crosses the x-axis"?

• x-intercept

• zero

• root

• all of these.

• solution

Tags

CCSS.HSF-IF.C.7C

Use the graph of f(x) to determine the real solutions to f(x)=0.

• -10

• 2, 5

• 0, 7

• no real solution

What are the solutions?

• 0 and 8

• -2 and -4

• 3 and -1

• 2 and 4

Solve for the values of x:
(x - 3)(x + 6) = 0

• { -3, -6 }

• { 3, -6 }

• { -3, -6 }

• { 3, 6 }

Tags

CCSS.HSA-REI.B.4B

Solve for b

• b=4/5, b=3

• b=4, b=-3

• b=1/5, b=3

• b=4/5, b=-3

Tags

CCSS.HSA-REI.B.4B

What are the solutions? (2x + 5)(5x - 2) = 0

• x = -5/2, -2/5

• x = -5/2, 2/5

• x = 5/2, 2/5

• x = 5/2, -2/5

Tags

CCSS.HSA-REI.B.4B

What are the x-intercepts?

2(x + 5)(x + 1) = 0

• x = 0, 5, 1

• x = 0, - 5, -1

• x = 5, 1

• x = -5, -1

Tags

CCSS.HSA-REI.B.4B