CCSS.Math.Content.HSA.REI.B.4

Convert x²-9x+20 to factored form and solve.

• (x-10)(x+2); x=-2, 10
• (x+4)(x+5); x=-5, -4
• (x-4)(x-5); x=4, 5
• Not factorable

Tags

CCSS.Math.Content.HSA.REI.B.4

Solve by factoring.
z² - 6z - 27 = 0

• z = 3 or z = 9
• z = 3 or z = -9
• z = -3 or z = 9
• z = -3 or z = -9

Tags

CCSS.Math.Content.HSA.REI.B.4

n² - 2n = 0

• n = 2 and 0
• n = -2 and 0
• n = 2
• n = 0

Tags

CCSS.Math.Content.HSA.REI.B.4

The quadratic equation can be used to solve quadratic equations that cannot be factored.

• True
• False

Tags

CCSS.Math.Content.HSA.REI.B.4

A ball is thrown into the air with an upward velocity of 100 ft/s. Its height, h, after t seconds is given by the function
 h = -16t² + 64t + 960.
When did the ball hit the ground?

• 10 seconds
• 2 seconds
• 5 seconds
• 7 seconds

Tags

CCSS.Math.Content.HSA.REI.B.4

If you square 5 more than a positive number, the result is 88 more than 12 times the number.  Find the numbers.

• -9, 7
• √75
• 9, -7
• 15, -5

Tags

CCSS.Math.Content.HSA.REI.B.4

Solve by taking square roots:

5b² - 4 = 41

• b = 9, b = -9

• b = 3, b = -3

• b = 8, b = -8

• no real solution

Tags

CCSS.Math.Content.HSA.REI.B.4

Solve by square roots:

x² - 4 = 76

• x = 4 , -4

• x = 4√5 , -4√5

• x = 80 , x = -80

• x = 5√4 or -5√4

Tags

CCSS.Math.Content.HSA.REI.B.4

Solve by factoring:

x² + 2x - 20 = 4

• x = -6, x = 4

• x = 6, x = -4

• x = 12, x = -2

• x = 8, x = -3

Tags

CCSS.Math.Content.HSA.REI.B.4

Solve using the Quadratic Formula:

 $b^2+b-56=0$  

•  $b=-8,\ 7$  

•  $b=-7,\ 8$  

•  $b=-1.4,\ 1.8$  

•  $b=-0.5,\ 2.5$  

Tags

CCSS.Math.Content.HSA.REI.B.4