9.1-9.4 Practice Quiz

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Answer explanation

Substitute each x value in the function to get the y-values.

Tags

CCSS.8.F.A.1

CCSS.HSF.IF.A.1

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Answer explanation

Substitute each x value in the function to get the y-values.

• (-2,16)

• (-1,4)

• (0,0)

• (1,16)

Answer explanation

In a table, the vertex is the point between the symmetry.

• (0,-1)

• (-1,0)

• (2,-9)

• (-2,-9)

Answer explanation

In a table, the vertex is the point between the symmetry.

When is the vertex of a parabola the minimum point?

• When the parabola is small.

• When the parabola is narrow.

• When the parabola opens up.

• When the parabola opens down.

When is the vertex of a parabola the maximum point?

• When the parabola is small.

• When the parabola is narrow.

• When the parabola opens up.

• When the parabola opens down.

• They both open down.

• They both open up.

• The a-value for both is (-1/2).

• They both have a minimum.

• One opens down, the other opens up.

• The a values are different.

• One of them is shifted one unit up.

• One of them is shifted one unit down.

Answer explanation

Remember, the c-value tells us the y-intercept, and how many units the parabola shifts up or down.

• x = 2
• x = 4
• x = 3
• x = 1

Answer explanation

To calculate the axis of symmetry, use -b/2a.

• (2, 3)
• (3, 1)
• (0, 1)
• (2, 1)

Answer explanation

Substitute -b/2a into the function for x to get the vertex.