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

The function f(t) = -5t²+20t + 60 models the approximate height of an object t seconds after it is launched. How many seconds does it take the object to hit the ground? 

• 4 seconds
• -2 seconds
• -6 seconds
• 9 seconds

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

Solve by taking square roots:
4m² - 100 = 0

• m=25, -25
• m=96
• m=5, -5
• m=-96

Tags

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

What are the green dots called?

• axis of symmetry
• vertex
• parabola
• roots or x-intercepts

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

What is the equation for axis of symmetry?

• y=3
• x=3
• x=5
• x=1

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

Solve the quadratic equation.
3x² - 8x - 8 = 0

• A    {0.38, -0.88} 
• B  {0.89, -8.9}
• C . {0.13, -0.63}
• D . {3.44, -0.77}

Tags

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

What are the x-intercepts?

• x= 2/3
• x= 4, x = -2
• x= -8, x = 1
• x= -4, x = 2

Tags

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

What are the x-intercepts for y = x² + 4x + 3

• -1 and -3

• 1 and 4

Tags

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

What should you do first in solving this equation?

x² + 6x - 13 = 3

• Factor

• Write down: a = 1, b = 6, c = -13

• Subtract 3 from both sides.

• Add 3 to both sides.

Tags

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

What are the zeros of f(x) = x²+9x+14

• 2, 7

• -2, -7

• 2, -7

• -2, 7

Tags

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

r is only useful for ...

• Quadratic functions

• Linear functions

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