Quadratic Functions 1

Which of the following is correct?

• y = –9x² – 4 is parabola.

• y = –7 – x² is not parabola.

• y = 5(x + 2) + 1 is parabola.

• y = –1 + 3x + x² is not parabola.

• a = , b = and c = –1

• a = 1, b = –2 and c = –5

• a = 5, b = 10 and c = 25

• a = 5, b = –10 and c = –25

Which function is this graph?

• y = 2x²

• y = –2x²

Which graph is functiono y = 4x²

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• 

Which graph has the largest value for a?

• 1

• 2

• 3

• 4

Given y = 2x². If x = 4 then y

• 8

• 16

• 32

• 64

Which of the following is the vertex of y = –3x² คือข้อใด

• (–3 0)

• (3, 0)

• (0, 3)

• (0, 0)

• 0

• –1

Which of th following is the symmetry axis of y = –x² ?

• x = –1

• x = 0

• can not find

• x = 1

Find x-intercet of y = 4x²

• (0, 0)

• (4, 0)

• (0, 4)

• none