Week 31 Classwork

Which is a solution to the following equation?

x² - 12x = 28

• x = 14

• x = 12

• x = 2

• x = 0

Which is the solution set

for the equation?

x² - 3x = 0

• {1,3}

• {-3,0}

• {0,3}

• {2,3}

Which is a zero of f(x) = x² - 15x + 54?

• 3

• 5

• 9

• 15

What is the solution set

for the equation?

(x + 2)(x - 4) = 0

• {2,-4}

• {-2,-4}

• {2,4}

• {-2,4}

The profit equation for a manufacturing firm is p = x² - 25 where p is profit and x is the number of units sold. For what number of units sold does the company break even (p = 0)?

• 5 units

• 10 units

• 50 units

• 25 units

Which is a zero of the function defined by the following equation?

f(x) = 2x - 6

• -6

• 3

• 2

• -3

What are the x-intercepts of the graph of the following equation?

y = x² + 5x + 4

• -4 and -1

• -2 and 3

• -1 and 1

• -1 and 2

Which is a zero of the following function?

f(x) = x² - x - 12

• 1

• 2

• 3

• 4

What is the solution set for the following quadratic function?

x² + 4 = 4x

• {2}

• {-2}

• {2,-2}

• {1,3}

The stress distribution on a structure is given by s = 2x² + 4x - 30, where s is the stress in pounds per square inch and x is the distance in feet from a reference point. At what distance is the stress equal to 0?

• 3 feet

• 5 feet

• 6 feet

• 12 feet